Orthognathic Surgery

491
CHAPTER 16  Complications Associated with Orthognathic Surgery
Or
Or
Or
O thth
r ogn
gn
g atatatatathicicicicicicicicic Su
S rg
r ery
ry
ry; J.C.
C Pos
os
os
osnicick
Or
Or
Or
Or
Or
Or
O thththththth
r ogn
gn
gn
gn
gn
gn
gn
gn
gnatatatatatatatatata hicicicicicicic Su
Su
Su
Su
Su
S rg
r ery
ry
r ; J.C.
C Pos
osnicick
J
I
Prior to retreatment
Pre surgery
After treatment
I, Occlusal views before retreatment, just before surgery, and then after successful treatment. J, Right oblique
facial views before and after successful treatment.
• Figure 16-7, cont’d 
Continued

492 SECTION 2  Planning, Surgical Technique, & Complications
Or
Or
Orthththth
r ogn
gn
gn
gn
gn
g atatata hicicicicicicicicicicicicic Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
S rg
r ery
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry; J.C.
C. Pos
os
o nick
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
O thththththththtr ogn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
g atatatatatatatatata hicicicicicicic Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Surg
r ery
ry
ry
ry
ry; J.C.
C.
C Posnick
K
• Figure 16-8  Individuals who are undergoing orthognathic surgery may experience intraoperative bur breakage. It is also not uncommon for
orthodontic brackets, hooks, or ligatures to loosen with the potential for loss in the surgical field. Because of the small size of the lost objects
within deep wounds, retrieval is not always advisable or possible. These foreign bodies can be visualized radiographically. Clinical follow up for
at least 1 year is recommended to confirm that no foreign body reaction or infection has occurred. A Panorex radiograph is shown before and
after orthognathic surgery. An orthodontic hook was lost in the right mandibular vestibular wound and can be seen on the Panorex radiograph.
No negative sequelae resulted.
K, Right profile views before and after successful treatment.
• Figure 16-7, cont’d

493
CHAPTER 16  Complications Associated with Orthognathic Surgery
Or
Or
Or
Or
Or
Or
Or
Orththththththththththththththththtr ogn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
g
tatatatatatathicicic Su
Su
Su
Surg
r ery
ry
ry
ry; J.C.
C.
C.
C.
C.
C. Pos
os
os
os
os
os
os
os
os
os
os
os
os
os
os
osnicicicicicicicicick
A
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
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Or
Or
Or
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Orthththththththththththththththththththththththththththththththththththtr ogn
gn
gn
gn
gn
gn
gn
gn
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gn
gn
gn
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gn
gn
gn
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gn
gn
gn
gn
gn
gn
gn
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gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
g atatatatatatatatatatatatatatatatatatatatatatatatatatatatatatatatatata hicicicicicicicicicicicicicicicicicicicicicicicicicicicicicicicicic Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Surg
r ery
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry; J.C.
C.
C.
C.
C.
C. Pos
os
os
os
os
os
os
os
os
o nicicicicicici k
B
• Figure 16-9  A woman in her mid 40s was referred for the surgical evaluation of asymmetric mandibular deficiency with
secondary deformities of the maxilla. A longstanding flattening of the left condylar head with a loss of posterior facial height
was felt to be responsible. There were no current symptoms of temporomandibular disorders, and the condyle was felt to
be stable. The patient had an asymmetric Class II excess overjet anterior open-bite malocclusion. An orthodontic and surgical
approach was selected. With orthodontic (dental) decompensation complete, surgery included maxillary Le Fort I osteotomy
in segments (arch expansion and cant improvement); bilateral sagittal split ramus osteotomies (minimal horizontal advance­
ment and asymmetry improvement); osseous genioplasty (horizontal advancement); redo septoplasty; and neck liposuction.
During surgery, a “bad split” was appreciated on the left side. Nevertheless, the ramus osteotomy was secured with three
bicortical screws. Radiographs the day after surgery confirmed a separate condylar component in the left ramus region.
Posteroanterior and lateral cephalometric and Panorex radiographs were again taken 10 days after surgery, and these were
suggestive of adequate segment approximation. At 5 weeks after surgery, left lateral mandibular facial swelling with mild
tenderness persisted. At 8 weeks after surgery, a left posterior mandibular vestibular fistula was appreciated. In the operating
room, the wound was opened to remove a buccal shelf and coronoid fragment as well as the fixation screws. Cultures
confirmed Escherichia coli, Enterobacter, alpha-hemolytic Streptococcus, and Candida. Oral antibiotics were initiated, includ­
ing clindamycin, ciprofloxacin, and Diflucan. At 11 weeks after surgery, there was a functional occlusion with good vertical
mouth opening and a mild shift to the left. At 9 months after surgery, facial morphology and occlusion remained acceptable,
and the orthodontic appliances were removed. A, Facial and occlusal views with orthodontics in progress. B, Profile and
lateral cephalometric views before surgery.
Continued

494 SECTION 2  Planning, Surgical Technique, & Complications
C
Long standing condylar flattening
Mandibular deficiency with shift to left
C, Panorex radiograph before surgery that indicates longstanding left condylar head flattening with
an intact cortical rim. There is mandibular deficiency and a shift to the left. D, Articulated dental casts that indicate analytic
model planning.
D
Arch expansion
Mandibular advancement and
counter clockwise rotation
Cant improvement
Asymmetry improvement
• Figure 16-9, cont’d

495
CHAPTER 16  Complications Associated with Orthognathic Surgery
Separate
condylar
component
F
10 day postoperative lateral and PA cephalometric radiographs
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Orththththththththththththththththththththththththtr ogn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
g atatatatatatatathicicicicic Su
Su
Su
Su
Surg
r ery
ry
ry
ry
ry; J.C.
C.
C.
C.
C.
C.
C. Pos
os
os
os
os
os
os
os
o nicicicicicicick
Or
Or
Or
Or
Or
Orthththththththththththththtr ogn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
g atatata hicicicicicic Su
Su
Su
Su
Su
Su
Su
Surg
r ery
ry
ry
ry
ry
ry; J.C.
C.
C.
C.
C Pos
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
o nicicicicicici k
G
Persistent left side
facial swelling
Before and 5 weeks after orthognathic surgery
E
Separate
condylar
component
1 day postoperative panorex
E, Panorex radiograph 1 day after surgery suggests a separate condylar component from the left
ramus. F, Lateral and posteroanterior cephalometric radiographs taken 10 days after surgery indicate the same. G, Facial
views before and 5 weeks after surgery. Persistent left side facial swelling is appreciated.
• Figure 16-9, cont’d 
Continued

496 SECTION 2  Planning, Surgical Technique, & Complications
H
5 weeks postoperative panorex
Right side - “good” split
Separate
condylar component
I
5 weeks postoperative panorex
Left side - “bad” split
Separate
condylar component
J
8 weeks postoperative CT
Coronoid-buccal
shelf segment
sequestrectomy
8 weeks postop
Left posterior mandibular
vestibule–small fistula
Coronoid-buccal
shelf segment
H, Panorex and computed tomography scan views of the right ramus 5 weeks
after surgery. I, Panorex and computed tomography scan views of the left ramus region 5 weeks after
surgery confirm a “bad split” that demonstrates the expected anatomy. J, Left ramus computed tomog­
raphy scan, left intraoral vestibular view, and sequestrectomy specimen with removed fixation screws.
• Figure 16-9, cont’d

497
CHAPTER 16  Complications Associated with Orthognathic Surgery
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Orththththththththththththththththththththththththththththththththth
r ogn
gn
gn
gn
gn
gn
gn
gn
gn
gn
g atatatatatatatathicicicicicicic Su
Su
Su
Surg
r ery
ry
ry
ry
ry
ry
ry; J.C.
C.
C.
C.
C Pos
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
osnicicicicicicicicicicicici k
Or
Or
Or
Or
Or
Or
Or
Or
Orthththththththththththththththththththththththtr ogn
gn
gn
gn
gn
gn
gn
gn
g atatatatathicicicicicic Su
Su
Su
Su
Su
Surg
r ery
ry
ry
ry; J.C.
C.
C.
C.
C Pos
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
osnicicicicicici k
K
Before and 11 weeks after orthognathic surgery
Resolving left side
facial swelling
Or
Or
Or
Or
Or
Or
Or
O thththththth
r ogn
gn
gn
gn
gnatatatatathicicici Su
Su
Su
Surg
r ery
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry; J.C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C Pos
os
os
os
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osnicicicicicicicicicicicicicicicicicicicicicicicicicicicicicicicicicicicicicicicicicicicicick
Or
Or
Or
Or
Or
Or
Orthththththththththth
r ogn
gn
gn
gn
gn
gnatatatatatathicicicicic Su
Su
Su
Surg
r ery
ry
ry
ry
ry
ry
ry
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ry; J.C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C Pos
os
os
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os
os
os
os
os
os
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os
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osnicicicicicicicicicicicicicicicicicicicicicicicicicicicicick
L
Or
Or
Or
Or
O ththth
r ogn
gn
gn
gn
g atatatatatatathicicicicicicicicicicici Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Surg
r ery
ry
ry
ry
ry
ry
ry
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ry
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C.
C.
C.
C.
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C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C Pos
os
os
os
os
os
os
os
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os
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os
os
os
os
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os
os
os
os
os
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os
os
os
os
os
os
os
os
o nicicicicicicicicicicicicicicicicicicicicicicicicicicicicick
Or
Or
Or
O thththth
r ogn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
g atatatatathicicicicicicicicicicicic Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
S rg
r ery
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
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ry
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ry
ry
ry
ry
ry
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ry; J.C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C Pos
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
o nicicicicicicicicicicicicicicicicicicicicicicicicicicicicicicicici k
M
K, Frontal views
in repose before and 11 weeks after
surgery. L, Left facial oblique views before
and then 11 weeks after surgery. M, Left
profile views before and 11 weeks after
surgery.
• Figure 16-9, cont’d 
Continued

498 SECTION 2  Planning, Surgical Technique, & Complications
N
Pre surgery
After initial healing
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Orththththththththththththththththththththth
r ogn
gn
gn
gn
gn
gn
gn
gn
gn
gn
g atatatatatatatatathicicicicicicicicici Su
Su
Su
Su
Su
Su
Su
Su
S rg
r ery
ry
ry
ry
ry
ry
ry
ry
ry
ry; J.C.
C.
C.
C.
C.
C.
C.
C Pos
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
o nicicicicicicicicicici k
O
9 months after surgery and finishing orthodontics
N, Occlusal views before surgery and then 11 weeks postoperatively. O, Nine months after the completion
of treatment, frontal facial and occlusal views demonstrate the results.
• Figure 16-9, cont’d 
When the condyle separates as a third piece, intraopera­
tive decisions will affect the postoperative recovery and
occlusion (see Fig. 16-9). From the perspective of the occlu­
sion, if the condyle or the medial pole remains with the
distal segment, it will be as if no osteotomy on the ipsilateral
side of the mandible was carried out. If no further action is
taken, an intraoperative malocclusion should be recognized.
To fully complete the ramus osteotomy, the surgeon must
then separate (i.e., osteotomize) the condyle from the distal
segment (i.e., create a third piece). The osteotomy should
be carried out, with as much ramus left on the condylar
segment (i.e., the third piece) as possible. Even when this
type of bad split occurs, unless significant mandibular
advancement is required for the correction of the jaw defor­
mity, the successful healing of the segments will generally
occur (see Figs. 16-9 and 16-10).
If the condyle separates (i.e., if a third piece is created)
“high up,” the result is similar to that of a high condylar
neck fracture. There will not be a stable posterior stop unless
the surgeon is able to carry out plate and screw fixation
of the condylar component (i.e., the third piece) to the rest
of the proximal segment. This may not be practical, and it
will depend on the morphology of the condylar piece. The
incidence of postoperative malocclusion will also be

499
CHAPTER 16  Complications Associated with Orthognathic Surgery
segment, a lingual plate fracture of the distal segment, and
a coronoid process fracture of the proximal segment are the
most commonly reported “bad splits”. Authors who con­
sider these types of less than ideal osteotomies to be bad
splits provide an explanation for the high incidence reported
in some series. As previously stated, the majority of less than
ideal separations (fractures) at the time of SSRO result in
fixation challenges, most are not responsible for long-term
negative sequelae.
The occurrence of a bad split is greatly reduced by
keeping the medial osteotomy “short (not to far back) and
low” (close to the occlusal surface of the mandibular molars)
(Fig. 16-11). Using this technique a bad split as described
should be a rare event (see Chapter 15).
Veras and colleagues evaluated risk factors and the func­
tional and radiographic long-term results of a bad split.350
They also completed detailed temporomandibular joint
dependent on the directional change planned for the distal
mandible. If the mandible is to be advanced a significant
amount, there is a greater probability that the minimally
stabilized condylar segment (i.e., the third piece) will not
heal in an ideal location relative to the residual proximal
and distal segments. Alternatively, if the mandible is to
remain relatively neutral or is set back, there is a higher
probability that the condylar segment will heal to the resid­
ual proximal and distal segments in a favorable way (see Fig.
16-9). As long as healing is associated with adequate mobil­
ity (i.e., mouth opening), then any residual malocclusion
can typically be managed 6 to 12 months later with redo
SROs, if desired (see Chapter 35).
Unfortunately, there is no consensus with regard to what
combination of factors predisposes an individual to a bad
split. The literature shows the incidence of bad splits to vary
from 1% to 23%. A buccal plate fracture of the proximal
• Figure 16-10  A teenager with a cleft jaw deformity underwent orthognathic surgery that included
a maxillary Le Fort I osteotomy in segments; bilateral sagittal split osteotomies of the mandible; and
an osseous genioplasty. The sagittal split on the left side separated unfavorably. The proximal segment
includes a condyle coronoid upper ramus component; an angle ramus component; and a buccal
shelf component. The three components of the proximal segment were secured together and fixed
to the distal segment with a combination of titanium plates and screws. Fortunately, the reduction
was adequate, so healing occurred with favorable facial aesthetics, occlusion, and temporomandibu­
lar joint function. A and B, Three-dimensional computed tomography scan views of a “bad split” fixed
into acceptable alignment during orthognathic surgery.
A
B

500 SECTION 2  Planning, Surgical Technique, & Complications
*References 3, 5, 6, 10, 12, 17, 18, 21, 37, 45, 51, 52, 55, 57, 65, 66,
69, 71, 88, 97-102, 106, 109, 112, 114, 121, 141-144, 160, 161, 166,
169, 193, 195, 196, 197, 227, 229-231, 234, 239, 258, 263, 265, 275,
277, 295, 296, 299, 301, 305, 327, 329-334, 344, 351, 354, 358-361,
369, 370, 368, 374, 376, 378, 380.
of the ramus.* This area is adjacent to and in front of the
inferior alveolar artery and vein and just inferior to the
occlusal plane of the mandibular molar teeth. The man­
dibular nerve becomes the IAN, and it runs with its vessels
within the canal and supplies sensation to the three molars
and the two premolar teeth. It then divides into two termi­
nal branches. The incisive branch supplies sensation to the
canine and incisor teeth, whereas the mental nerve exits from
the foramen to supply sensibility to the chin, the lower lip
mucosa and skin, and the adjacent gingiva. Damage to the
IAN during either the ramus osteotomies or when complet­
ing an oblique osteotomy of the chin may occur. During
SSRO of the mandible, the IAN can be damaged by a bur
on a rotary drill, a saw blade on a reciprocating saw, an
osteotome, or during the placement of plate and screw fixa­
tion (Fig. 16-12).
Posnick and colleagues completed a study to clarify
normal chin, lower lip, and gingival sensibility in adoles­
cents and then compared the normal values with sensibility
measurements in three distinct groups of adolescents 1 year
after these individuals had undergone mandibular osteot­
omy.261,263 One hundred fifteen subjects (230 mental
nerves) were included in the study and divided into four
groups. The first group included 67 individuals (Group I:
n = 134 nerves; mean age, 18 years) who were undergoing
orthodontic treatment; none had undergone orthognathic
surgery. This group served as controls to determine the
normal sensibility values of the chin, the lower lip, and the
gingiva in adolescents. The remaining three groups were
made up of adolescents who had previously undergone
examinations on patients with bad splits. Interestingly, they
did not find the simultaneous extraction of a mandibular
third molar in conjunction with an SSRO to be a risk factor
for the development of a bad split. This is consistent with
the research reported by Kriwalsky and colleagues,174 Pre­
cious and colleagues,268 and others (see discussion earlier in
this chapter).
Inferior Alveolar Nerve and
Mental Nerve Injury
Facial sensibility of the area affected by either an SSRO or
a chin osteotomy occurs through the mandibular nerve,
which enters the mandibular foramen at the medial surface
• Figure 16-11  Illustration of this author’s preferred “short and low”
medial osteotomy of the sagittal split to minimize an incidence of a
“bad split.”
• Figure 16-12  Intraoperative views of a right sagittal split ramus osteotomy. The demonstration of cortical cuts completed A, before and B, after
the splitting (separation) and mobilization of the segments. The inferior alveolar nerve is visualized in the surgical field.
Cortical cuts completed
A
B
Sagittal split separated
Inferior
aveolar nerve

501
CHAPTER 16  Complications Associated with Orthognathic Surgery
BSSRO and osteoplastic genioplasty, 67% of patients expe­
rienced varying degrees of residual subjective loss of sensa­
tion in the chin and lip region.
Espelan and colleagues completed a 3-year postopera­
tive survey of patients who had undergone SSRO (N = 583
subjects) and found that that 36.8% of the study patients
reported impaired sensation over the long term.96A Wester­
mark and colleagues completed a retrospective study of
patients who had undergone SSRO and concluded that
nearly 100% of the patients experienced impaired sensation
and sensory function.358 This is also consistent with the
findings of Essick and colleagues97 and Teerijoki-Oksa
and colleagues.332,333 The exact reasons why, over time,
most patients experience only a degree of simple loss of
sensation—whereas some continue to experience active sen­
sations that are not normally present and an even smaller
percentage of those with active sensations subjectively
describe them as uncomfortable or painful (dysesthesia)—
are not known. Zuniga and colleagues reported a 5%
incidence of dysesthesia of the IAN after SSRO.380,381
Turvey reported a 5.5% incidence of IAN lacerations at
the time of SSRO.343 Van Merkesteyn and colleagues
documented a visible injury in the IAN at the time of SSRO
in 7 out of 124 patients (6%).347 The term traumatic
neuroma is used to describe the formation of a bulbous mass
that develops at the end of a proximal nerve stump after
partial or complete nerve transection. The lesion represents
an exaggerated relative hyperplasia (i.e., healing) response
to a nerve injury. Neuroma symptoms range from paresthe­
sia to severe paroxysmal or persistent pain. Despite the
incidence of partial or complete transection of the IAN at
the time of SSRO, few cases of traumatic neuroma have
been documented. This is likely because the healing tran­
sected nerve remains deep in the medullary cavity of the
mandible. It is known that a healing nerve stump within
bone is rarely painful. The few reported cases of neuroma
after SSRO have confirmed the location to be within the
soft tissues along the inferior border of the mandible.120,121
Essick and colleagues completed a clinical trial that
determined that the magnitude and duration of the patient-
reported burden of altered sensation after SSRO was lessened
when facial sensory retraining exercises were performed in
conjunction with standard mouth-opening exercises as
compared with the group of patients who performed only
mouth-opening exercises.97 The authors defined the term
burden as the person’s reporting of subjective impressions of
numbness or unusual sensations (i.e., dysesthesia) in the
face, the perioral region, and or oral region. One interpreta­
tion of the study findings is that patients who perform
facial sensory retraining become more introspective with
regard to their altered sensation, which leads to a greater
acceptance of their sensory loss by 6 months after surgery.
Consistent with this interpretation was the finding that
sensory retrained patients initially viewed numbness and
decreased sensitivity as more problematic early during
recovery but as less problematic later during recovery than
did the group of patients who did not undergo retraining.258
BSSRO of the mandible (Group II: n = 14 nerves; mean
age, 19 years), osteoplastic genioplasty (Group III: n = 40
nerves; mean age, 19 years), or a combination of BSSRO
and osteoplastic genioplasty (Group IV: n = 42 nerves;
mean age, 19 years). Testing of Groups II, III, and IV was
performed 1 year after the patients had undergone the indi­
cated mandibular procedures. At the time of the 1-year
postoperative examination, each patient was also asked to
detail subjective impressions of current altered sensibility in
the mandibular vestibular mucosa, the gingiva, the lower
lip, and the chin region. The subjective questioning and
objective testing were carried out by an occupational thera­
pist who was trained in facial sensibility testing and familiar
with the surgical procedures carried out. Fixed and repro­
ducible coordinates in the area corresponding to the mental
nerve were used for objective testing (Fig. 16-13). Three
sensory modalities were tested at each coordinate for each
involved nerve. Static two-point discrimination was mea­
sured with a MacKinnon–Dellon Disk-Criminator (Rich­
ardson Productions, Inc, Frankfort, Ill); vibratory thresholds
were determined with a biothesiometer; and cutaneous
pressure thresholds were measured with a set of Semmes–
Weinstein monofilaments. Sensibility values at 1 year after
operation for Groups II, III, and IV were compared with
the mean normal control values established for Group I. A
subjective awareness of alterations in the sensibility of the
chin, lip, or gingiva region 1 year after BSSRO was reported
in 2 patients in Group II (29%), in 2 patients in Group III
(10%), and in 14 patients in Group IV (67%). Interestingly,
only 2 of these 18 patients considered the residual sensory
loss problematic. The mean objective sensibility values of
the three sensory modalities tested were highest among
patients from Group IV. Significant differences were found
only between the mean two-point discrimination of Group
IV patients as compared with the control group in the chin
skin area. Thus, 1 year after BSSRO, only 29% of patients
had residual subjective awareness of sensory alteration along
the distribution of the mental nerve. After an osseous genio­
plasty, there was only a 10% incidence of long-term subjec­
tive diminished sensibility. One year after a combination of
• Figure 16-13  Illustration of sites for sensibility testing in the inferior
alveolar and mental nerve distribution. In a study carried out by Posnick
and colleagues, coordinates 6, 8, and 10 located within each of the
circled areas were tested bilaterally.
6
10
8

502 SECTION 2  Planning, Surgical Technique, & Complications
was not proven to be significantly better than expected after
the simple approximation of the nerve endings within the
ramus of the mandible.
The retraining sessions were held at 1 week, 1 month, and
3 months after surgery. The levels of instruction for the
sensory retraining were designed to increasingly challenge
patients’ sensory discrimination abilities in a manner similar
to that of the early and late phases of sensory retraining
commonly used after injuries to the sensory nerves of the
hand.120,121 Through sensory retraining, individuals learn to
discriminate moving touch from non-moving touch; the
orientation of moving touch; and the direction of moving
touch (see Chapter 11). Poort and colleagues completed a
literature review of methods that are used to test for sensory
loss and recovery after IAN injury and recommended that
clinicians and researchers use the following two measure­
ment tools: 1) a light touch test with Semmes–Wienstein
monofilaments for grading sensation; and 2) a visual analog
scale–based questionnaire to evaluate the individual’s sub­
jective sensibility.261A If clinicians were to adopt consistent
measuring techniques, improved communication with
regard to sensory loss and level of recovery after interven­
tions would likely follow.
A dilemma that surgeons continue to face is what to do
in the operating room when the laceration of the IAN is
witnessed. The question raised asks if there is any significant
long-term advantage for the patient to undergo either
primary or delayed micro repair of the lacerated IAN.
Although the concept of the immediate repair of a wit­
nessed IAN transection is appealing, the practicality of this
maneuver and the patient’s long-term improved results (i.e.,
greater sensory return and decreased dysesthesia) have not
been statistically confirmed. The increased operative time
and the potential risks of losing focus on the primary
orthognathic objectives must also be considered. Tay and
colleagues reported four cases of immediate micro-neural
repair of an IAN that was transected during SSRO.334 This
represented 4 out of 260 (2%) SSROs completed at their
center. One of the four patients who sustained IAN lacera­
tion was apparently lost to follow up. Interestingly, the
location of IAN transection in the remaining three study
patients was at the anterior and inferior aspect of the oste­
otomy along the buccal shelf between the first and second
molars; this is a recognized “danger zone” for IAN transec­
tion during SSRO. When there is a moderate to severe
degree of mandibular hypoplasia with the need for buccal
shelf extension of the proximal segment to achieve success­
ful approximation of the bone after advancement, this risk
may increase. In the study by Tay and colleagues, the three
study patients underwent immediate repair of the IAN (i.e.,
neurorrhaphy) by a trained microsurgeon and then received
follow for 1 year.334 The microsurgeon’s technique included
the complete surgical release of the nerve from the man­
dibular foramen to the mental foramen followed by approx­
imation and repair with the use of 6-0 microfilament suture
under microscope magnification. The increased time of the
surgery was approximately 3 to 4 hours. Although the
authors felt favorable regarding the outcomes of their
patients, the level of sensory return that was documented
NOTE:  This author believes that a controlled study
documenting significantly better sensory recovery after
direct micro-neural repair that occurs via the simple
approximation of the cut edges of the IAN in the setting
of an SRO would be required to justify the added time
and risk of the repair.
Lingual Nerve Injury
The incidence of injury to the lingual nerve during
SSRO is not precisely known, but it is assumed to be
rare.35,132,145,147,279,289-291,327 Becelli and colleagues com­
pleted a retrospective analysis of complications after SSRO
and found a 0.6% rate of lingual nerve dysfunction among
482 osteotomy patients during the first postoperative week.
The authors documented complete resolution of this injury
after 12 months of follow up in the study group. Interest­
ingly, lingual nerve injury at the time of the removal of
mandibular wisdom teeth as an isolated procedure is also
estimated to be in the same range (i.e., <1%).260 When a
lingual nerve injury does occur with SSRO, it likely occurs
during subperiosteal dissection along the medial ramus;
when using a rotary drill (e.g., with a Lindeman bur); or
when using the reciprocating saw (e.g., during a medial
ramus cortical cut). It may also occur with use of the elec­
trocautery to control bleeding, during screw fixation, or
when closing the wound if the lingual nerve is caught
within the suture tie (Fig. 16-14).
Pogrel and Hung Le completed a cadaver study that
demonstrated that different modalities (e.g., sharp scalpel
laceration, fissure bur injury, retraction stretch injury) pro­
duced different types of nerve injury, both clinically and
histologically.261 The clinical recovery of the injured nerve
is believed to be primarily related to the type of injury
sustained. For this reason, the treatment recommended
should also vary in accordance with the type of injury sus­
tained. Data reveal that 57% of lingual nerve injuries were
unknown to the surgeon at the time; therefore, the type of
injury could not be accurately ascertained.86
Unfortunately, many of the published lingual nerve
injury studies are retrospective case series or questionnaire
surveys.260 The studies also frequently combine both lingual
and IAN injuries. The literature recommends that observed
injuries and those involving a foreign object causing com­
pression or laceration (e.g., endodontic filling material,
bone fragment, broken instrument) should be treated
immediately. Caution is warranted when interpreting two-
dimensional radiographic views when making decisions
about impingement on the nerve by a foreign object (e.g.,
a fixation screw). Three-dimensional computed tomography
scans may be useful to help make the determination.

503
CHAPTER 16  Complications Associated with Orthognathic Surgery
prospect of deterioration is not insignificant. The evaluation
and management of both lingual and IAN dysfunction after
an SSRO remains a challenging clinical dilemma. The spe­
cific etiology and incidence of persistent sensory deficit and
neuropathic pain after SSRO remains poorly understood.
Nevertheless, prudent care suggests that, when a lingual
nerve injury occurs during a ramus osteotomy, the surgeon
is obliged to offer evaluation by a knowledgeable peripheral
nerve surgeon within 3 to 6 months. This will ensure that
the injured individual receives the information needed to
make a personal decision about how to proceed.
Facial Nerve Injury
Reports of injury to other than sensory nerves are primarily
restricted to the facial nerve, and these mainly occur during
mandibular procedures.60,68,77,79,226,272,287 A retrospective
study conducted by de Vries and colleagues after SSRO (N
= 1747) found an incidence of seventh nerve palsy of 0.26%
(9 patients).83 Choi and colleagues found an incidence of
facial nerve palsy of 0.1% among 3105 patients who under­
went sagittal split ramus osteotomies.60
Significant Bleeding
In current practice, significant bleeding is rarely encountered
at the time of SSRO.16,64,177,184,185,191,207,253,288,303,306,326,372
In 1972, a 38% incidence of major intraoperative hemor­
rhage was reported; in 2005, an incidence of only 1% was
reported.184,257 The vessels to consider include the maxillary
artery and its branches; the retromandibular vein; and the
facial artery and vein. Behrman reported about two patients
with excessive bleeding in which he carried out ligation of
the external carotid artery, although doing so was relatively
ineffective for controlling the hemorrhage.23 In 1985,
Turvey reported the incidence of troublesome hemorrhage
to be 1.2%; the inferior alveolar and facial arteries were the
sources.322 Acebal-Bianco and colleagues reported about the
laceration of the facial artery during SSRO in two patients
with successful management.2 Van Merkesteyn and col­
leagues discussed difficult-to-control bleeding from the
inferior alveolar and facial arteries in two patients.257 Teltz­
row and colleagues reported bleeding from the retroman­
dibular vein to be the most common source of severe
hemorrhage after SSRO.335
The occurrence of a false aneurysm (i.e., pseudoaneu­
rysm or traumatic aneurysm) after an elective mandibular
ramus osteotomy is uncommon. Precious and colleagues
reported three cases of false aneurysm after SSRO and
reviewed the pertinent literature.269 A false aneurysm will
present as a delayed phenomenon, usually 1 to 16 weeks
after injury. These conditions are thought to result from a
partial transaction of an artery (i.e., a facial artery) that
leads to the extravasation of blood under pressure into the
surrounding soft tissues. The resultant hematoma orga­
nizes, and this is followed by fibrous pseudocapsule and
Patients with severe hypoesthesia who are demonstrating no
sensory improvement at approximately 3 months after treat­
ment may be surgical candidates. Those with at least some
documented continuous sensory improvement are best
managed conservatively.
Susarla and colleagues used a retrospective cohort study
design to address whether the early repair of a lingual nerve
injury improves functional sensory recovery.324 The study
sample was composed of 64 subjects with lingual nerve
injuries who underwent repair with a mean time between
injury and repair of 153 days (31 to 1606 days). Twenty-
two percent of the subjects underwent early repair (i.e., <90
days after injury). The nerves were repaired either through
direct suture (77%) or surgical exploration with decompres­
sive neurolysis (23%). Ninety-three percent of the study
subjects in the early repair group achieved functional sensory
recovery within 1 year as compared with only 63% in the
late repair group. Although early repair shows statistical
benefits for the achievement of functional sensory recovery,
it must also be assumed that a percentage of those individu­
als who submitted to early repair would have gone on to
achieve adequate recovery through the natural course of
events. A randomized clinical trial would be required to
clarify any clear advantage of early repair.
A study by Bagheri and colleagues suggests that, for
some individuals, secondary repair of a lingual nerve or IAN
injury will result in the regaining of acceptable sensory
function as classified by the Medical Research Council
Scale.17 However, at least some of those who are undergoing
secondary repair will show little improvement, and the
• Figure 16-14  A completed right sagittal split ramus osteotomy. The
separation of the segments demonstrates both the inferior alveolar and
lingual nerves. The lingual nerve is only occasionally visualized in the
surgical field.
Lingual
nerve
Inferior
alveolar
nerve
Sagittal split separated

504 SECTION 2  Planning, Surgical Technique, & Complications
jaw deformity. Facial sensibility testing was conducted in
the three groups 1 year after the Le Fort I osteotomy. Each
patient was also asked about his or her subjective impres­
sions of altered sensibility in the maxillary vestibular mucosa,
the gingiva, the upper lip, or the cheek region at the 1-year
examination. Previously defined fixed and reproducible
coordinates were used for objective testing in the area that
corresponds with the infraorbital nerve (Fig. 16-16).267
Three sensory modalities were tested bilaterally at each coor­
dinate. Static two-point discrimination was measured
with a MacKinnon–Dellon Disk-Criminator. Vibratory
thresholds were determined with the biothesiometer, and
cutaneous pressure thresholds were measured with a set of
Semmes–Weinstein monofilaments. The data was com­
pared with the mean normal values that had been previously
established for adolescents with and without cleft lip and
palate before any orthognathic surgery.
The data confirmed that, at 1 year after Le Fort I oste­
otomy, none of the patients reported any subjective aware­
ness of alterations in the sensibility of the maxillary vestibular
mucosa, upper lip, or cheek regions. No significant differ­
ences were found in the mean postoperative values at each
coordinate among the three groups in any of the sensory
modalities tested. No significant differences were found
then endothelialization. A pulsatile and expanding mass
characterizes a false aneurysm. The difficulty of this situa­
tion is related to the making of an accurate and timely
diagnosis. The treatment approaches include primary
surgical resection, arterial embolization, or arterialization
followed by surgical resection. Superselective arterial embo­
lization alone is the current preferred approach, whenever
feasible.
The surgeon’s best protections against these unusual vas­
cular events when carrying out a sagittal split ramus oste­
otomy remain the following: 1) careful patient selection
2) meticulous technique 3) good intraoperative assistance
4) protective instrument placement and 5) fine control of
power tools. When severe hemorrhage does occur after
SSRO, interventional radiology procedures versus the direct
ligation of the involved vessels must be considered.
Risks and Complications Specific
to Le Fort I Osteotomy
Infraorbital Nerve Injury
Sensory innervation of the area affected by the Le Fort I
osteotomy is mainly through the maxillary division of the
trigeminal nerve. During the Le Fort I osteotomy, the three
superior alveolar nerves on each side are transected as part
of the osteotomy, and the terminal labial branches of the
infraorbital nerve are transected as part of the mucosal inci­
sion. After the infraorbital nerve emerges from the infraor­
bital foramen, it is also subject to trauma. A degree of injury
to the infraorbital nerve at the time of Le Fort I osteotomy
that results in temporary paresthesia is expected, whereas
permanent dysesthesia of the cheek skin, the upper lip,
the palate mucosa, and the gingiva is thought to be less
common.* The nerve injury may result from compression
or stretching, and direct injury may result from saw blades,
burs, or surgical instruments (Fig. 16-15). The patient’s age
and gender will also be factor when considering nerve recov­
ery and the occurrence of dysesthesia.
Posnick and colleagues objectively measured facial sen­
sibility in adolescents (with and without cleft lip and palate)
1 year after Le Fort I osteotomy.263 Fifty-nine individuals
(118 infraorbital nerves) were included in the study and
divided into three groups. The first group (N = 30) included
subjects with unilateral cleft lip and palate (mean age, 18
years; with jaw deformity). The second group (N = 12)
included subjects with bilateral cleft lip and palate (mean
age, 19 years; with jaw deformity). All of these patients had
undergone cleft lip and palate repair earlier during their
lives; none had an associated craniofacial syndrome, devel­
opmental delay, or systemic neurologic impairment. The
third group (N = 17) consisted of subjects without clefts or
syndromes (mean age, 19 years) but with a developmental
• Figure 16-15  Intraoperative view after a circumvestibular incision
for exposure to complete a Le Fort I osteotomy. The infraorbital nerve
is visualized.
Infra orbital nerve
• Figure 16-16  Illustration of the infraorbital nerve sensibility distribu­
tion. Coordinates 3, 4, 5, 7, and 9 are fixed sites that were used by
Posnick and colleagues for sensibility testing.
5
4
3
9
7
*References 7, 52, 57, 71, 97-99, 120, 154, 160, 161, 261, 264, 265,
267, 273, 295, 323, 380, 381.

505
CHAPTER 16  Complications Associated with Orthognathic Surgery
performed at a higher level to avoid tooth bud injury in
their patients with cleft palates during the mixed dentition.
Therefore, the osteotomies were closer to the skull base and
the orbit. The authors also speculated that the hard palate
in the tuberosity region and the PM junction may have been
more sclerotic as a result of the repaired cleft palate, thereby
making precise PM disjunction less predictable.
Of the nine reported cases of blindness after Le Fort I
osteotomy, five were of unknown cause, one was due to
arterial aneurysm, two were attributed to propagation of the
PM disjunction fracture through the skull base, and one
was the result of the hypoperfusion of the optic nerve. There
was no recovery in three cases, light perception returned in
three, hand movements were visible in one, fingers could
not be counted in one, and visual acuity showed much
improvement in one. Interestingly, a majority of the reported
cases of monocular blindness were in individuals born with
cleft lip and palate. These patients had all undergone
primary lip and palate repair, and several had previously
undergone unsuccessful Le Fort I osteotomies. This likely
represents a higher than average risk group for the rare
complication of monocular blindness.194
Extraocular Cranial Nerve Dysfunction
Newlands and colleagues identified five cases of abducens
palsy, three cases of oculomotor palsy, and one case in which
both palsies were present together.129,135,199,237,307,356 Most
reported cases of extraocular nerve dysfunction after Le Fort
I osteotomy occur immediately after surgery, although it has
been reported up to 5 days postoperatively.
Nasolacrimal Apparatus Dysfunction
Tearing dysfunction has been reported after Le Fort I oste­
otomy by a number of authors; this involves either a lack
of or excessive tearing.202,210,211,300,338 A lack of tearing is
thought to have occurred as a result of damage to the greater
petrosal or Vidian nerve, which could interrupt parasympa­
thetic supply to the lacrimal gland. Excessive tearing is
thought to be related to nasolacrimal duct damage.
Significant Bleeding
Vascular complications (i.e., excessive bleeding)—either
immediate or delayed—after Le Fort I osteotomy are rare.*
The reported cause of the delayed bleeding is generally a
partial laceration of a vessel with an aneurysm or an arterio­
venous fistula formation (i.e., false aneurysm). The confirma­
tion of a traumatic vascular abnormality is best made by
angiography. This condition most frequently occurs in the
internal maxillary artery or in the internal carotid artery
region. The presentation of bleeding from the nose and
occasionally from the oral cavity early after surgery is the
typical clinical event. When massive epistaxis occurs soon
between the preoperative and postoperative pressure and
vibratory threshold values in each patient group. The mean
postoperative static two-point discrimination values were
higher than the preoperative values in all areas tested and
in all patient groups, but significant differences (i.e., P <
.05) were found only in the anterior cheek skin area (coor­
dinate 3) in the patients with unilateral cleft lip and palate
on both the cleft and non-cleft sides. The study carried out
by Posnick and colleagues confirmed the clinical impression
that permanent functional sensory alteration of the soft
tissue supplied by the infraorbital nerve is rare among teen­
agers and young adults after Le Fort I osteotomy.
Thygesen and colleagues recently looked at risk factors
for paresthesia and dysesthesia of the infraorbital nerve after
Le Fort I ostoeomy.337 Their results are somewhat different
from those of Posnick and colleagues. The authors found
objective changes in somatosensory function 12 months
after Le Fort I osteotomy in 7% to 60% of patients, depend­
ing on the site at which the sensory measurement was
carried out (i.e., skin, gingiva, or palatal mucosa). The
authors did not report instances of significant dysesthesia
associated with the sensory loss in any patient. Despite a
degree of subjective sensory loss at 12 months after surgery,
all of the study patients were satisfied with the results of
their operation, with 100% saying that they would do it
again.
Visual Disturbances
Blindness
Decreased visual acuity (blindness) is a rare complication of
Le Fort I osteotomy.* Although the exact mechanism of
injury to the optic nerve has not been clarified, atypical
fracture patterns that extend upward to the skull base from
the pterygomaxillary (PM) separation at the time of down-
fracture have been implicated.180,309,340,366 Girotto and col­
leagues reported on three cases of visual loss after elective
standard Le Fort I osteotomy.115 All three cases were pre­
sumed to be straightforward and were performed by expe­
rienced surgeons. The authors hypothesized that the
unpredictable nature of the PM dysjunction may result in
the extension of fracture to the skull base or generate
deforming forces to the optic canal, with compression and
pressure placed on the optic nerve. Lanigan reviewed the
literature up through 1993 and reported two cases of blind­
ness after Le Fort I osteotomy.188 Bendor-Samuel and col­
leagues reported one additional case of blindness.28 Lo and
colleagues reported two cases of monocular blindness in 94
consecutive cleft palate patients who underwent mixed den­
tition maxillary (Le Fort I) osteotomy with osteodistraction
with the use of the RED II Distraction System (KLS Martin,
Mühlheim, Germany) during a 4-year period.154 Although
the exact etiology could not be clarified by Lo and col­
leagues, they stated that the PM disjunctions were
*References 28, 31, 43, 54, 58, 59, 67, 70, 115, 148, 188, 198, 199, 274,
278, 286, 339.
*References 4, 15, 40, 41, 64, 74, 116, 123, 126, 134, 136, 140, 168,
181, 183, 185, 187, 189, 190, 204, 205, 219, 236, 240, 241, 280, 302,
306, 308, 310, 316.

506 SECTION 2  Planning, Surgical Technique, & Complications
laceration of the sphenopalatine or descending palatine
artery. It is recommended that ligation or cauterization of
the descending palatine artery be carried out when partial
laceration occurs. It is also suggested that the orthognathic
patient be allowed to emerge from hypotensive anesthesia
before wound closure in an attempt to identify any major
bleeding before the patient leaves the operating room.
Aseptic Necrosis of Maxilla
A rare but serious complication of Le Fort I osteotomy is
ischemic necrosis.25,27,38,44,86,87,124,128,179,182,235,251,271,298,373 The
severity of this postoperative complication is related to the
degree of vascular compromise of the down-fractured maxil­
lary segments. Reported sequelae of vascular compromise
include infection, mucosa sloughing, periodontal defects,
pulpal changes, malunion or nonunion, and the partial or
complete loss of the maxilla and dentition (Figs. 16-17,
16-18, and 16-19).
The biologic basis for maxillary (i.e., isolated segmental,
down-fracture Le Fort I, and down-fracture Le Fort I with
segmentation) osteotomies used in orthognathic surgery
was extensively investigated in experimental animals by Bell
and colleagues with the use of microangiographic and
after Le Fort I osteotomy, the differential diagnosis may
include coagulopathy, bleeding from a partially resected
inferior turbinate, or bleeding from a large artery (i.e., the
internal maxillary artery). Angiography with the possible
need for embolization should be considered. A frequent
palliative (but temporary) treatment approach is the packing
of the nose. This is likely to immediately control bleeding;
however, over time, a false aneurysm may form, and rebleed­
ing (i.e., recurrent epistaxis) is typical.
Procopio and colleagues described one patient (a 37-year-
old woman who had undergone Le Fort I down-fracture)
whose epistaxis occurred 2 hours after surgery and who was
treated with anterior nasal packing.270 Seven days later, she
was taken back to surgery to reposition her maxilla for the
treatment of malocclusion. No source of excessive bleeding
was found. Further epistaxis occurred on days 21, 53, 63,
85, and 115. These episodes were treated with nasal packing,
which resulted in resolution for short periods of time fol­
lowed by rebleeding. On day 115, angiography and a com­
puted tomography scan were completed. A false aneurysm
of the sphenopalatine artery was identified and successfully
embolized.
The standard deliberate hypotensive anesthesia techniques
used during Le Fort I down-fracture can mask a partial
• Figure 16-17  An individual who was born with a bilateral cleft lip and palate was treated at another institution. During the
mixed dentition, he underwent unsuccessful iliac (hip) bone grafting and fistula closure. The premaxilla remained mobile, with
residual alveolar clefts. When he was 17 years old, he underwent maxillary Le Fort I osteotomy, also at another institution.
Unfortunately, given the residual alveolar clefts, the circumvestibular incision that was used resulted in circulation injury to the
premaxilla (i.e., aseptic necrosis). Unless the bilateral cleft is successfully grafted through at least one of the alveolar sites, a
circumvestibular incision that cuts through the labial vestibule of the premaxilla will predictably result in aseptic necrosis.
A and B, Occlusal and palatal views are shown during the mixed dentition after unsuccessful grafting. C and D, The same
views are shown during the teenage years after unsuccessful Le Fort I osteotomy with aseptic necrosis of the premaxilla and
the resulting oronasal fistula.
A
B
C
D

507
CHAPTER 16  Complications Associated with Orthognathic Surgery
Alteration of the hemodynamics within the intramedullary
cavity after total maxillary down-fracture was felt to produce
only transient and clinically insignificant intraosseous isch­
emia (see Chapter 2).
In clinical practice, controversy continues to exist regard­
ing the management of the descending palatine artery
(DPA) during Le Fort I osteotomy. Some surgeons advocate
the preservation of the DPA, whereas others ligate the
vessel routinely. Dodson and colleagues completed a pro­
spective randomized clinical study of patients (N = 34) who
underwent Le Fort I osteotomy.86,87 The individuals were
randomly assigned to either Study Group 1 (N = 26), in
which the DPA was ligated, or Study Group 2 (N = 18), in
histologic techniques to study revascularization and wound
healing (see Chapter 2).25 Meyer and colleagues also com­
pleted animal studies involving radioactive microsphere
methods to quantify preoperative and postoperative blood
flow after classic osteotomies.219 The results of Bell’s micro­
angiographic and histologic studies showed minimal tran­
sient vascular ischemia, minimal osteonecrosis, and early
osseous union, with the maxilla pedicled essentially to the
palatal mucosa. The preservation of the integrity of the descend­
ing palatine arteries was not found to be essential to maintain
circulation to the down-fractured maxilla. The periosteal vas­
cular bed provides adequate reserve blood supply after
down-fracture, even with ligation of the named vessels.
• Figure 16-18  A man in his 20s presented with a maxillary deficiency and a relative mandibular excess growth pattern. He under­
went orthodontics and reconstruction, including a Le Fort I osteotomy in three segments (i.e., interdental cuts between the lateral
incisor and the canine on each side). Approximately 3 months after surgery, the right lateral incisor crown was noted to be dark in
color. No other symptoms occurred. A postoperative radiograph shows the interdental osteotomy site. There was no direct injury to
the dental root on either side of the osteotomy. The pulp of the tooth was treated with root canal therapy. Bleaching is planned to
whiten the crown. Occlusal views are shown before orthodontics, at 5 weeks after surgery, and after successful reconstruction. An
illustration and a maxillary model show the location of segmental osteotomies.
Prior to treatment
5 weeks after surgery
6 months after surgery
5 weeks after surgery
• Figure 16-19  Occlusal views are shown of a teenage girl with a long face growth pattern. She underwent an orthodontic and
surgical approach. The surgery included maxillary Le Fort I osteotomy without segmentation. By 5 weeks after surgery, the right
maxillary central incisor was noted to be dark in color. No other symptoms occurred. A postoperative radiograph showed no signs
of root injury or periapical pathology. The pulp of the tooth was treated with root canal therapy followed by bleaching.
Pulpal necrosis
Pre treatment
5 weeks after Le Fort I
1 year after Le Fort I

508 SECTION 2  Planning, Surgical Technique, & Complications
which the DPA was preserved. The researchers measured
maxillary gingival blood flow during the operation with the
use of a laser Doppler flow meter, and they found “no sta­
tistically significant differences in mean maxillary gingival
blood flow between patients having the DPA ligated and
those having the DPA preserved.”87 The maintenance of
adequate flap circulation through the palatal mucosa
attached to the hard palate is the key to the avoidance of
this problem.
Documented cases of aseptic necrosis after maxillary
osteotomies primarily come from the questionnaire survey
conducted by Lanigan and colleagues.182 The authors sent
out 5000 questionnaires to oral and maxillofacial Surgeons,
and 800 replies were received. Fifty-one cases of aseptic
necrosis after maxillary surgery were reported from 44 sur­
geons who had encountered this specific complication. The
number of cases reported was assumed to be less than the
magnitude of the clinical problem in practice. The results
of the questionnaire suggested that, at the time of the survey
(i.e., in 1986), a Le Fort I osteotomy performed in multiple
segments in conjunction with superior repositioning and
transverse expansion (especially when significant palatal
perforations occurred) was more likely to result in a tenuous
blood supply to the anterior maxilla, with resulting aseptic
necrosis. More recently, Singh and colleagues described a
single patient from the United Kingdom who underwent
maxillary Le Fort I osteotomy with down-fracture (without
segmentation) and who sustained aseptic necrosis of approx­
imately two thirds of the total maxilla.305 The patient’s risk
factors included nicotine abuse, the use of deliberate hypo­
tensive anesthesia in the presence of baseline hypertension,
and uncontrolled intraoperative bleeding. In 2010, Pereira
and colleagues reported a case of maxillary aseptic necrosis
after Le Fort I osteotomy.255 The patient was 52 years old,
with baseline hypertension, an ongoing smoking history of
two packs per day, and chronic generalized periodontal
bone loss and gingival recession. He underwent Le Fort I
down-fracture osteotomy with horizontal advancement.
Uncommon bleeding was noticed in the posterior region
intraoperatively, and this was treated with gauze compres­
sion. On the seventh postoperative day, the researchers
reported that the “[m]ucosa overlying the maxilla was isch­
emic and covered with a pseudomembrane.”255 The patient
was treated with 20 sessions of hyperbaric oxygenation. The
maxilla and the associated dentition were preserved, but
further alveolar bone loss occurred.
Palatal Fistula
The tearing of the palatal mucosa can occur at the time of
either surgically assisted rapid palatal expansion (SARPE)
or standard parasagittal segmental osteotomies carried out
through the Le Fort I down-fracture. A tear is more likely
to become clinically apparent when significant transverse
expansion is undertaken. Intraoperative palatal mucosa
tears at the time of segmental osteotomy will occur and are
best managed by meticulous nasal mucosa closure and by
interposing a middle layer to limit epithelialization with
fistula tract formation during the healing of the palatal
mucosa. This can be accomplished with a biocompatible
material (e.g., Surgicel, fibrin glue, acellular collagen matrix)
that is placed through the down-fractured maxilla directly
onto the bony palate (i.e., the floor of nose side) after sta­
bilization of the segments into the prefabricated splint and
before the placement of maxillary plate and screw fixation.
By instituting precautions to limit pressure gradients across
the opening and by avoiding hard food boluses on the roof
of the mouth during initial healing, spontaneous closure is
typically seen. Under these circumstances, long-term persis­
tent fistulization of a palatal mucosal tear after segmental
osteotomies is uncommon. When a palatal (i.e., oronasal)
fistula remains and is of clinical concern as a result of a loss
of fluid and air, it can be closed with the use of local palatal
flaps (Fig. 16-20). Surgical closure should be postponed
until 6 to 12 months after Le Fort I osteotomy to ensure
adequate maxillary revascularization. During the interim, a
custom acrylic palatal plate can be used to both obturate
the palatal–nasal opening and to assist with the mainte­
nance of the new arch form.
Fibrous Union (Painless Mobile Maxilla)
The fibrous union of the maxilla after Le Fort I osteotomy
is an infrequent complication.78,162,200,342,350 Risk factors
should be recognized, and surgical techniques and postop­
erative management may then be adjusted to limit this
complication. The combination of extensive horizontal
advancement and vertical lengthening results in large oste­
otomy site defects with limited bone contact. Failure to
form adequate bony bridges at the healing sites is likely to
result in delayed healing, fibrous union, or late relapse.
Influences on bone healing at the Le Fort I osteotomy site
may include the following: 1) injury to flap circulation
2) thin osteoporotic bone at the buttress and the pyriform
rims with inadequate stabilization (fixation) 3) the decision
being made to not place interpositional grafts when the
bone gaps are of critical size (as described previously)
4) infection or wound dehiscence after surgery 5) the pres­
ence of a heavy occlusion (e.g., grinding, clenching) 6) too
rapid of a return to normal chewing forces 7) excessive
mouth opening against intermaxillary elastics and 8) stress
fracture of the fixation plates. Systemic risk factors for poor
bone healing include 1) diabetes; 2) collagen disease;
3) vascular disease; 4) osteoporosis and the use of bisphos­
phonates; 5) nicotine use; 6) poor nutritional status; and
7) prior radiation.
This author has experience with four of his own patients
who underwent Le Fort I osteotomy and then developed
fibrous union of the maxilla (Fig. 16-21). This represents a
small percentage (i.e., <0.5%) of the total group of Le Fort
I osteotomies performed. In each case, initial healing seemed
unremarkable, with no infection or wound dehiscence.
There were no signs of vascular compromise at the time of
Text continued on p. 516

509
CHAPTER 16  Complications Associated with Orthognathic Surgery
• Figure 16-20  A 48-year-old woman with a long face growth pattern and Angle Class II anterior open-bite malocclusion is shown. The patient
underwent four bicuspid extractions and orthodontic treatment during childhood as a compensatory approach. She was referred by a restorative
dentist to an orthodontist and then to this surgeon for evaluation. She was found to have obstructive sleep apnea, chronic obstructive nasal
breathing, and a long face growth pattern with a Class II tendency. She underwent a comprehensive surgical, orthodontic, and dental rehabilita­
tive approach. The procedures included maxillary Le Fort I osteotomy in two segments (interdental osteotomy between the central incisors and
then parasagitally down the hard palate). The maxillary segmentation was to widen the posterior arch by several millimeters. When placing the
maxillary segments into the intermediate splints, a tear in the palatal mucosa at the parasagittal osteotomy location was appreciated. This was
managed with Gelfoam and tissue glue through the down-fracture along the floor of the nose and with meticulous nasal mucosa suturing. A
fistula persisted at 1 year after surgery, with air loss affecting her speech (i.e., hypernasal speech) and fluid loss occurring into the nose when
she was drinking liquids. She underwent outpatient surgery to elevate the palatal flaps, to separate the nasal and palatal mucosa, to suture
closed the nasal side, and then to suture closed the palatal side. She was placed on a mechanical soft diet and sinus precautions for 4 weeks.
The fistula was successfully closed. A, Palatal view before surgery. B, Model planning indicating two-segment maxillary osteotomy with widening
at the molar region. C, Palatal view 1 year after surgery indicating a persistent oronasal fistula. D, Palatal view 3 months after the successful
surgical closure of the fistula.
A
B
Palatal view prior to surgery
Segmental osteotomies with widening
C
D
Palatal fistula early after surgery
Successful surgical closure of fistula

510 SECTION 2  Planning, Surgical Technique, & Complications
Or
Or
Or
Or
Or
Or
Or
Orththththththththththththththththththtr ogn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
g atatatatatatatatatathicicicicicicicicicicic Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
S rg
r ery
ry
ry
ry; J.C.
C.
C.
C.
C Pos
os
os
os
os
os
os
os
os
os
os
os
os
os
os
o nicicicicicicicicici k
A
• Figure 16-21  A woman in her mid 40s with an asymmetric mandibular excess growth pattern arrived for surgical evaluation. The
longstanding asymmetric Angle Class III negative overjet anterior open-bite malocclusion had been detrimental to her dentition. She
required crown restorations and had a need for root canal therapy in several of the posterior teeth. She desired the correction of
the malocclusion (i.e., improved chewing and speech articulation) and improved lip closure (i.e., relief of mentalis strain). She had a
lifelong history of obstructed nasal breathing and was found to have septal deviation and inferior turbinate enlargement. She agreed
to an orthodontic and surgical approach. Orthodontic (dental) decompensation was followed by surgery that included maxillary Le
Fort I osteotomy (horizontal advancement, clockwise rotation, and vertical lengthening); bilateral sagittal split ramus osteotomies
(asymmetry correction); osseous genioplasty (horizontal advancement); and septoplasty and inferior turbinate reduction. The quality
of the maxillary buttress bone was noted to be thin, and it did not hold the fixation plates and screws firmly in all locations as com­
pared with bone of average thickness; however, it was felt to be adequate. No interpositional graft was used, and initial healing was
on track. Five weeks after surgery, the patient progressed to a normal diet and her regular physical activities. She also returned to
the care of her orthodontist. Postoperative radiographs (lateral cephalometric and Panorex) did not look out of the ordinary. Three
months after surgery, during a routine orthodontic evaluation, she was found to have mobility of the maxilla but without pain and
with a good occlusion. The diagnosis of fibrous union at the Le Fort I osteotomy site was made. The patient was placed on a liquid
diet, told to avoid clenching and heavy biting forces, and asked to stop all use of interarch elastics. Despite a waiting period of an
additional 2 months, a painless mobile maxilla (i.e., fibrous union) remained. The patient was returned to the operating room, where
she underwent the following:
• Standard circumvestibular incision and subperiosteal anterior maxillary exposure
• Removal of all maxillary fixation plates and screws
• Down-fracture and complete disimpaction
• Removal and cleaning out of all fibrous tissue along the osteotomy sites
• Placement of the maxilla into the preferred occlusion through a prefabricated splint
• Adjustment of the maxilla to the preferred anterior vertical height
• Placement of new titanium bone plates and screws at each zygomatic buttress and pyriform aperture
• Harvesting and crafting of the iliac (hip) corticocancellous graft
• Placement of a bloc graft in each bony gap between the zygomatic buttress and the pyriform plates
• Securing of each graft with an additional titanium microplate and screws
• Packing of additional cancellous bone along the osteotomy sites
• Wound closure
At 5 weeks after surgery with indications of good healing, the patient’s diet and physical activities were advanced, and she was
returned to her orthodontist’s care for maintenance. The appliances were removed 3 months later. A, Facial and occlusal views
before treatment.

511
CHAPTER 16  Complications Associated with Orthognathic Surgery
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Orththththththththththtr ogn
gn
gn
gn
gn
gn
gn
gn
gn
g atatatatatatatatatatatathicicicicicicicicicicicicicicicicicicicicicicic Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Surg
r ery
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry; J.C.
C.
C.
C.
C.
C.
C.
C.
C Pos
os
os
os
o nicick
C
D
Mandibular
straightening
Maxillary clockwise
rotation
Or
Or
Or
Or
Or
O ththththththththtr ogn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
g atatatatatatatatatatatatathicicicicicicicicicic Su
Su
Su
Su
Su
Su
Su
Su
S rg
r ery
ry
ry
ry
ry
ry; J.C.
C.
C.
C.
C Pos
os
os
os
os
os
os
os
osnicicicicicicicicicici k
B
B, Facial and occlusal views with orthodontic decompensation in progress. C, Facial profile and cephalo­
metric views before surgery. D, Articulated dental casts that indicate analytic model planning.
• Figure 16-21, cont’d 
Continued

512 SECTION 2  Planning, Surgical Technique, & Complications
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
O ththththththththththththth
r ogn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gnatatatatatatatatatatatatatatatata hicicicicicicicicicicici Su
Su
Su
Su
Su
Surg
r ery
ry; J.C.
C.
C.
C.
C.
C.
C. Pos
os
os
os
os
os
os
os
os
os
osnicicicicicicicicicicicici k
E
Fibrous union–mobile maxilla!
Good occlusion–no pain!
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
O ththththththththth
r ogn
gn
gn
gn
gn
gn
gn
gn
gn
gn
g atatatatatatatatatatatatatatata hicicicicicicicicici Su
Su
Su
Su
Su
Su
Su
Su
Surg
r ery
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry; J.C.
C.
C.
C.
C.
C.
C.
C Pos
os
os
os
os
os
o nicicicick
F
Fibrous union–mobile maxilla!
Good occlusion–no pain!
E, Facial and occlusal views 3 months after surgery, when the fibrous union was recognized. F, Facial
and lateral cephalometric views 3 months after surgery, when the fibrous union of the maxilla was recognized.
• Figure 16-21, cont’d

513
CHAPTER 16  Complications Associated with Orthognathic Surgery
Continued
G
Prior to hardware removal
After redo osteotomy and downfracture
Stress
fracture
plates
H
G, Intraoperative views showing the fibrous union and the stress-fractured plates before removal and
down-fracture. The removed plates are also shown. Three of the four plates were “fractured.” The maxilla is then shown after the
removal of the plates and screws, the down-fracture, and the cleaning out of fibrous tissue. H, Intraoperative views showing the
maxilla secured with new plates (one at each zygomatic buttress and the pyriform rim) and screws. Bloc corticocancellous (iliac)
grafts are in place, with additional plates and screws. Additional cancellous graft is packed into all defects before wound closure.
• Figure 16-21, cont’d

514 SECTION 2  Planning, Surgical Technique, & Complications
Or
Or
O ththththththththth
r ogn
gn
gn
gn
gn
gn
gn
gn
gn
gn
g atatatatatatatatatata hicicicicicicicicic Su
Su
Su
Su
Su
Su
Surg
r ery
ry
ry
ry
ry
ry
ry; J.C.
C.
C.
C Pos
os
os
os
os
os
os
os
os
os
os
os
os
os
osnicicicicicicicick
Or
Or
Or
Or
Or
Or
Or
Or
Or
Orthththththththththththtr ogn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
g atatatatata hicicicicicicic Su
Su
Su
Su
Surg
r ery
ry; J.C.
C.
C.
C.
C. Pos
os
os
os
os
os
os
o nici k
I
Or
Or
O ththththth
r ogn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
g atatatatatatatatatatatatatathicicicicicicicicicicicicicic Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Surg
r ery
ry
ry
ry
ry; J.C.
C.
C Pos
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
osnicicicicicicicicicicicicicicick
Or
Orthththththththththththththth
r ogn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gnatatatatatatatatatatatatatatatatatatatathicicicicicicicicicici Su
Su
Su
Su
Su
Su
Surg
r ery
ry
ry
ry
ry
ry; J.C.
C.
C.
C.
C.
C.
C.
C.
C Pos
os
os
os
os
osnicicicicick
J
Or
Orthththththththththth
r ogn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
g atatatatatatatatatatatatatatathicicicicicicicicicic Su
Su
Su
Su
Su
Su
Su
Su
Su
S rg
r ery
ry
ry
ry
ry
ry
ry
ry
ry; J.C.
C.
C.
C.
C.
C.
C.
C.
C. Pos
os
os
os
os
os
os
os
o nicicick
Or
Or
Or
Orththththththththth
r ogn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gnatatatatatatatatatatata hicicicicicicicicicici Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Surg
r ery
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry; J.C.
C.
C.
C.
C.
C.
C. Pos
os
os
os
os
os
os
o nicicicicicici k
K
I, Frontal views
in repose before and after successful
reconstruction. J, Frontal views with smile
before and after successful reconstruc­
tion. K, Oblique facial views before and
after successful treatment.
• Figure 16-21, cont’d

515
CHAPTER 16  Complications Associated with Orthognathic Surgery
Or
Or
Or
Or
Or
Or
Or
Or
Or
O hththththththththththththth
r ogn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
g atatatatatatatatatatatatatatatatatath cicicicicicicicicicicicicicic Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
S rg
r ery
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry; J.C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C. Pos
os
os
os
os
os
os
o nicici k
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Orthththththththththththth
r ogn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
g atatatatatatatatatatatathicicicicicicicicicicicicic Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Su
Surg
r ery
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry
ry; J.C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C.
C. Pos
os
os
os
os
osnicicicicicicicici k
L
M
Prior to treatment
Pre surgery
After treatment
L, Profile views before and after successful treatment. M, Occlusal views before treatment, before surgery,
and after successful treatment.
• Figure 16-21, cont’d 
Continued

516 SECTION 2  Planning, Surgical Technique, & Complications
N
N, Preoperative and late postoperative lateral cephalometric radiographs.
• Figure 16-21, cont’d 
osteotomy or after surgery. None of the patients were felt
to have more than average residual mobility at the 5-week
postoperative interval upon return to their orthodontist’s
care. They were then encouraged to gradually return to a
regular diet and the usual physical activities as well as to
work toward normal mouth opening. The four affected
individuals were as follows:
1. A 15-year-old Caucasian individual with Down syn­
drome who underwent Le Fort I osteotomy, SSRO of the
mandible, and oblique osteotomy of the chin. The
maxilla underwent horizontal advancement and verti­
cal lengthening without interpositional grafting.
Maxillary stabilization was performed with a titanium
plate placed at each pyriform aperture, and the zygo­
matic buttress region was secured with screws. The
quality of the bone was thin and did not hold the
fixation screws as firmly in all locations as is typical.
Initial healing was felt to be normal. The patient
returned to the orthodontist’s care at 5 weeks without
special concerns.
2. A 25-year-old Asian graduate student who presented
with congenital facial palsy that resulted in maxillofacial
skeletal asymmetry. This patient underwent Le Fort
I osteotomy, SSRO of the mandible, and oblique
osteotomy of the chin. The maxilla underwent cant
correction and intrusion with minimal horizontal
advancement. Stabilization was obtained with a tita­
nium plate placed at each zygomatic buttress, and
the pyriform aperture was secured with screws. The
quality of the bone was thin and did not hold the
fixation screws as firmly at all locations as is typical.
Initial healing was felt to be normal. The patient
returned to her orthodontist’s care at 5 weeks without
special concern.
3. A 45-year-old woman with a history of osteoporosis that
had previously been treated with oral bisphosphonates.
This patient’s jaw deformity was characterized by
maxillary deficiency with relative mandibular excess.
She underwent Le Fort I osteotomy, SSRO, and
oblique osteotomy of the chin. The maxilla was hori­
zontally advanced and vertically lengthened. Stabili­
zation was performed with a titanium bone plate
placed at each zygomatic buttress, and the pyriform
aperture was secured with titanium screws. The
quality of the bone was thin and did not hold the
fixation screws as firmly as is usual at all locations,
but it was felt to be adequate. No interpositional graft
was placed, and initial healing was felt to be normal.
The patient returned to her orthodontist’s care at 5
weeks without special concerns.
4. A 45-year-old woman with an asymmetric mandibular
excess growth pattern (see Fig. 18-20). This patient
underwent Le Fort I osteotomy, SSRO, and oblique
osteotomy of the chin. The maxilla was horizontally
advanced and vertically lengthened. Stabilization was
with a titanium plate placed at each pyriform aper­
ture, and the zygomatic buttress was secured with
screws. The quality of the bone was thin; it did not
hold the fixation screws firmly at all locations as is
average, but it was felt to be adequate. No interposi­
tional graft was placed, and initial healing was felt to
be normal. The patient returned to her orthodontist’s
care at 5 weeks without special concerns.
Each of the four patients presented back to this surgeon
between 4 and 6 months after surgery complaining of pain­
less but visible motion of the maxilla when clenching and
chewing. Each individual presented at that time with a good
occlusion and favorable facial aesthetics but with a pain-free
mobile maxilla with movement that was observed during
compressive occlusal forces. In each case, the patient was
placed on a liquid diet and told to avoid clenching and
heavy biting forces, and the use of elastics was stopped.
Despite a waiting period of an additional 2 months, a pain­
less mobile maxilla (i.e., fibrous union) remained in each
case. One of the four individuals elected not to proceed with
further surgery and continues to have a painless mobile

517
CHAPTER 16  Complications Associated with Orthognathic Surgery
and a prefabricated splint; the maintenance of a non-chew,
liquid diet for 5 weeks; and the absence of postoperative
infection or wound dehiscence.)
Acute and Chronic Nasal Obstruction
Buckling and deviation of the nasal septum can occur
during the superior repositioning of the maxilla after Le
Fort I osteotomy (see Fig. 16-22). When vertically intrud­
ing the maxilla, adequate resection of the inferior aspect of
the cartilaginous and bony septum is required to avoid this
complication.208 If the septum is properly managed at oper­
ation, the occurrence of a “crooked nose” after the removal
of the nasotracheal tube should be uncommon. Visual
inspection of the nose is necessary after maxillary reposi­
tioning just before and again after extubation to confirm
that the septum remains straight. If septal displacement is
observed after extubation and is simply due to nasotracheal
tube pressure, then limited manual manipulation in the
recovery room will suffice. If the surgeon did not adequately
resect (i.e., manage) the inferior aspect of the septum when
completing a Le Fort I intrusion, then a return to the oper­
ating room to do so will be required.
The most common reason for persistent postoperative
nasal obstruction is preoperative chronic nasal obstruction
that was not recognized and addressed (see Chapter 10).
The second likely cause of persistent nasal obstruction is
inadequate recontouring of the nasal floor, the pyriform
rims, and the anterior nasal spine in conjunction with max­
illary intrusion.
maxilla during mastication. The other three patients under­
went further maxillary surgery. The procedure included the
following steps:
1. Return to the operating room with general anesthe­
sia through standard nasotracheal intubation
2. Maxillary circumvestibular incision and standard
subperiosteal dissection for Le Fort I exposure
3. Removal of all maxillary fixation plates and screws
4. Down-fracture and complete disimpaction
5. Removal of all fibrous tissue at the osteotomy sites
6. Placement of the maxilla into the preferred occlu­
sion with the mandibular dentition using a prefab­
ricated splint; adjustment of the maxilla to the
preferred vertical height
7. Placement of new titanium plates and screws at each
zygomatic buttress and pyriform aperture
8. Harvesting of iliac (hip) corticocancellous graft.
9. Crafting of a corticocancellous (iliac) bloc graft and
placement in the bony gaps between the zygomatic
buttress and the pyriform plates on each side
10. Securing of each corticocancellous graft with an
additional titanium plate and screws
11. Packing of additional cancellous bone along the
osteotomy sites
12. Closure of the circumvestibular wound
The three patients who underwent further treatment
were maintained on a blenderized diet and placed on limited
physical activities for 5 weeks. No intermaxillary fixation
and only a limited use of elastics and compression occlusal
forces were instituted during this time.
Interestingly, in the three patients who received addi­
tional treatment, the fracture of most of the titanium plates
was recognized at the time of the redo Le Fort I osteotomy
(see Fig. 16-21D). One explanation is that the titanium
plate failure occurred soon after surgery. If so, then the
fractured plates would be responsible for inadequate immo­
bilization at the osteotomy site, thereby resulting in fibrous
union. Another explanation is that bony union did not
occur at the usual time (i.e., approximately 4 to 5 weeks
after surgery). The initially successful plate and screw fixa­
tion masked the fibrous union for several months; this was
followed by the eventual stress fracture of the titanium
plates in response to the continuous masticatory compres­
sive occlusal forces. Painless mobility of the maxilla eventu­
ally became noticeable to the patient (i.e., 4 to 6 months
after surgery), and this was then brought to the surgeon’s
attention.
Despite this author’s extensive experience with cleft
orthognathic surgery that often requires maxillary segmen­
tation with significant horizontal advancement and vertical
lengthening, no cases of fibrous union have occurred in this
patient group. The author believes that the routine use of
interpositional iliac (hip) grafts placed at the Le Fort I
osteotomy site in patients with clefts who are undergoing
significant advancement and vertical lengthening is helpful.
(This is in addition to the use of titanium plates and screws
Text continued on p. 525
NOTE:  A worsening of any preoperative chronic
nasal obstruction in the patient with a long face growth
pattern is more likely to occur if the baseline excess
anterior nasal floor height is not simultaneously
addressed (Fig. 16-22).
Acute and Chronic Maxillary Sinusitis
The occurrence of persistent maxillary sinusitis that requires
treatment after Le Fort I osteotomy is not thought to be
common, but the true incidence has not been fully
studied.256,374 When maxillary sinusitis after Le Fort I oste­
otomy does occur, it may be due to the following: 1) changes
in the clearance mechanism of sinus mucous; 2) the reten­
tion of a blood clot in the sinus cavity; 3) dental infection;
4) the presence of foreign bodies (e.g., grafts, loose fixation
devices) in the sinus cavity; or 5) the anatomic blockage of
the osteomeatal opening (Fig. 16-23). A blocked ostium can
generally be assessed with fiber-optic nasoendoscopy in the
office setting. The occurrence of a loose displaced graft that
cannot be expressed through the ostium and that then
becomes chronically contaminated with bacteria should also
be ruled out. A sinus computed tomography scan is helpful
to clarify these issues. Standard titanium fixation screws are
expected to perforate through the anterior wall into the

518 SECTION 2  Planning, Surgical Technique, & Complications
Orthth
r ogn
gn
gn
gn
gn
gn
g atatathicic Su
Su
Surg
r ery
ry
ry; J.C.
C.
C.
C Pos
os
os
os
os
os
os
os
os
os
osnici k
A
B
5 weeks after Le Fort I impaction
Deviated
septum
Excess nasal
floor height
C
Incisal edge to ANS
Patient is 40 mm
Incisal edge to ANS
Should be 30 mm
• Figure 16-22  A woman in her mid 30s was diagnosed with a long face growth pattern and mild obstructive sleep
apnea. She underwent perioperative orthodontics and orthognathic procedures, including maxillary Le Fort I oste­
otomy (horizontal advancement and vertical intrusion); bilateral sagittal split osteotomies of the mandible (advance­
ment); and osseous genioplasty (horizontal advancement). The surgery was carried out by another surgeon.
Immediately after surgery, in the recovery room, significant asymmetry and distortion of the base of the nose and
nasal tip were recognized. Although the patient generally convalesced well, there was persistent obstructed nasal
breathing and noticeable nasal base and tip asymmetry and distortion. At 5 weeks after surgery, consultation with
this surgeon occurred. Clinical and radiographic examination confirmed uncorrected excess anterior alveolar maxillary
height as well as a buckled and deviated quadrangular cartilage. Visually, there was marked distortion of the base
of the nose and nasal tip as well as blocked nasal airflow. The patient was taken to the operating room and under­
went general anesthesia through orotracheal intubation. A limited intraoral circumvestibular incision was made with
the dissection of the anterior maxilla, the floor of the nose, and the anterior aspect of the septum. The maxillary
incisal edge to the anterior nasal spine measured 40 mm (elongated by three standard deviations) and confirmed
vertical excess. The quadrangular cartilage was buckled and deviated, which further contributed to an obstructed
left nasal passage. Using a rotary drill with a watermelon bur and a rongeur, the nasal rims, the floor of the nose,
and the anterior nasal spine were recontoured and lowered toward normal morphology. The incisal edge to the
anterior nasal spine now measured 30 mm. The inferior aspect of the quadrangular cartilage was resected and
repositioned to the midline. A, Frontal facial view at 5 weeks after initial surgery indicating distortion and asymmetry
of the nasal base and tip. B, Intraoperative view of anterior vertically maxillary excess and buckled quadrangular
cartilage at redo surgery. C, Measurement of the incisal edge to the anterior nasal spine (40 mm) before recontouring
confirms the baseline elevation of the nasal floor.

519
CHAPTER 16  Complications Associated with Orthognathic Surgery
D
Planned recontouring
Rotary drill to recontour
E
F
G
Nasal floor recontoured
Reduction of ANS
Resection of inferior septum
D, Pencil marks indicate the planned lowering of the floor of the nose. E, The floor of the nose is recontoured (lowered)
with a rotary drill. F, This is followed by rongeur resection and refinement of the nasal spine. G, A rongeur was then used to resect the inferior
aspect of the quadrangular cartilage.
• Figure 16-22, cont’d 
Continued

520 SECTION 2  Planning, Surgical Technique, & Complications
Or
Or
Or
Or
Or
O thththththtr ogn
gn
gn
gn
gn
gn
g atatatathicic Su
Su
Su
Su
S rg
r ery
ry
ry
ry; J.C.
C.
C.
C.
C.
C. Pos
os
os
os
os
os
os
os
os
os
o nicicici k
Or
Or
Or
Orththththth
r ogn
gn
gn
gn
gn
gn
gn
g atatathicici Su
Su
Su
Surg
r ery
ry
ry; J.C.
C.
C.
C.
C.
C.
C.
C Pos
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
os
osnicicicici k
H
5 weeks after Le Fort I impaction with
crooked nose
8 weeks after Le Fort I- 3 weeks after
recountouring/septoplasty
Or
Or
Or
Orthththththththththththththththth
r ogn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
gn
g atatata hicicicicicicicic Su
Su
Su
Su
Su
Su
Surg
r ery
ry
ry; J.C.
C.
C.
C.
C Pos
os
os
os
os
os
os
os
os
os
os
os
os
os
osnicici k
A
B
Left facial swelling
Left maxillary vestibular drainage
• Figure 16-23  A 19-year-old man with a maxillary deficiency in combination with asymmetric mandibular
excess presented for treatment. He also had chronic obstructed nasal breathing. He was referred for
orthodontic and surgical correction. His surgery included maxillary Le Fort I osteotomy (horizontal advance­
ment and clockwise rotation); bilateral sagittal split osteotomies of the mandible (correction of asymmetry);
osteotomy of the chin (horizontal advancement); septoplasty; and inferior turbinate reduction. In the pres­
ence of a penicillin allergy, prophylactic clindamycin antibiotic was initiated just before surgery and con­
tinued for 5 days. Approximately 2 weeks after surgery, left cheek region swelling and intraoral purulent
drainage were noted. A computed tomography scan confirmed a fluid-filled left maxillary sinus. The patient
was restarted on clindamycin (600 mg by mouth four times daily), and a Penrose drain was inserted into
the left maxillary vestibular wound. The cultures confirmed beta-hemolytic streptococci (Group C). Sen­
sitivities indicated that ciprofloxacin was the antibiotic of choice, so the patient was started on a 10-day
course. He was also placed on nasal decongestants. Within days, the drainage subsided, and the swelling
diminished. The Penrose drain was removed 1 week after insertion. At 5 weeks after surgery, the healing
of the osteotomies remained on track, and the patient resumed a regular diet. At 6 weeks, left cheek
swelling recurred. A computed tomography scan confirmed a fluid-filled maxillary sinus without adequate
drainage into the nose. Nasoendoscopy confirmed a blocked ostium. The endoscope was used to create
an ostium to drain the sinus. No further sequelae occurred. A, Frontal facial view 2 weeks after surgery
showing left cheek swelling. B, Left maxillary vestibular wound indicating the site of drainage.
H, Facial views of the patient 5 weeks after the initial orthognathic procedure
and then 3 weeks after secondary revision (i.e., recontouring of the floor of the nose and septoplasty).
The patient’s nose is no longer crooked, and the nasal airway is now patent.
• Figure 16-22, cont’d

521
CHAPTER 16  Complications Associated with Orthognathic Surgery
C
D
Fluid filled left
maxillary sinus cavity
Post operative CT scan
demonstrates osteotomy locations
E
F
6 weeks after orthognathic surgery
Fluid filled left maxillary siunus
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
Or
O ththththththththththththththththththththththththth
r ogn
gn
gn
g atatata hicicici Su
Su
Su
Surg
r ery
ry
ry
ry
r ; J.C.
C.
C. Pos
os
os
osnicicicicicicicicicick
C, A computed tomography scan taken 2 weeks postoperatively confirmed a fluid-filled left maxillary
sinus. D, A computed tomography scan taken 2 weeks after surgery indicated the osteotomy locations and the repositioning
of the jaws. E and F, Frontal facial and sinus computed tomography scan views at 6 weeks indicating recurrent left maxillary
sinus blockage and mucocele.
• Figure 16-23, cont’d 
Continued

522 SECTION 2  Planning, Surgical Technique, & Complications
Orth
r ognathic Surg
r ery; J.C. Posnick
Orth
r ognathic Surg
r ery; J.C. Posnick
Orth
r ognathic Surg
r ery; J.C. Posnick
Orth
r ognathic Surg
r ery; J.C. Posnick
G
H
G, Frontal views in repose before and 6 months after treatment. H, Frontal views with smile before and
6 months after reconstruction.
• Figure 16-23, cont’d

523
CHAPTER 16  Complications Associated with Orthognathic Surgery
Orth
r ognathic Surg
r ery; J.C. Posnick
Orth
r ognathic Surg
r ery; J.C. Posnick
Orth
r ognathic Surg
r ery; J.C. Posnick
Orth
r ognathic Surg
r ery; J.C. Posnick
I
J
I, Oblique facial views before and 6 months after treatment. J, Profile views before and 6 months after
treatment.
• Figure 16-23, cont’d 
Continued

524 SECTION 2  Planning, Surgical Technique, & Complications
Prior to retreatment
Pre surgery
After surgery
K
K, Occlusal views before redo orthodontics, with orthodontics in progress, and after treatment.
• Figure 16-23, cont’d

525
CHAPTER 16  Complications Associated with Orthognathic Surgery
antibiotics to cover both oral flora and skin organisms is
useful for the limiting of this complication. If an implant
is placed to augment the chin (rather than a chin osteotomy
being performed) a higher rate of infection is expected.
Mental Nerve Injury
The mental nerve is at risk for injury in association with an
osseous genioplasty.114,238,349 When the soft-tissue dissection
and retraction carried out for the exposure of the chin are
carefully completed, the mental nerves will be stretched but
rarely lacerated or avulsed. If this is the case, the observed
immediate loss of sensibility in the lip and chin region
should be temporary. The mental nerve can be cut during
the soft-tissue incision. Care is taken with the lateral aspect
of the incision to avoid this problem. The nerve can be
stretched excessively or avulsed from the mental foramen
during retraction at the time of osteotomy (see Chapter 15).
It is important to remember that the nerve dips below the
mental foramen posteriorly. The nerve also extends anteri­
orly (i.e., the incisal nerve) and may be injured in this
location. After genioplasty, approximately 10% of patients
will experience a degree of permanent loss of sensibility in
the distribution of the mental nerve on one or both sides.
sinus. They are often presumed to be the source of sinusitis;
however, this author’s experience, that is rarely the case.
Interestingly, the most common reason for postoperative
chronic sinusitis is preoperative chronic sinusitis that was
not recognized and addressed.
The entity of a surgical ciliated cyst has been reported
after elective orthognathic procedures. These cysts are typi­
cally lined with respiratory epithelium. The pathogenesis is
hypothesized to involve antral mucosa that is exposed at the
time of Le Fort I osteotomy. If the cyst is located in the soft
tissues, the displaced mucosa will have been “trapped” in
the surgical wound. When the cyst is located in the antrum,
then the etiology is thought to be disrupted mucosa trapped
in the sinus behind a closed ostium.
Risks and Complications Specific
to the Oblique Osteotomy of the Chin
(see Chapter 38)
Infection
Infection occurs in less than 1% of patients who are under­
going osseous genioplasty. The routine use of prophylactic
L
Maxillary Clockwise Rotation
M
L, Articulated dental casts indicate analytic model planning. M, Lateral cephalometric radiographs
before and after reconstruction.
• Figure 16-23, cont’d

526 SECTION 2  Planning, Surgical Technique, & Complications
• Figure 16-24  An osseous genioplasty was carried out for the vertical lengthening (interpositional graft) and hori­
zontal advancement of the chin. Postoperative radiographs indicate the closeness of screw fixation (1.7 mm wide
and 4 mm in length) to the lateral incisor but without root resorption. The darkening of the crown indicated pulpal
injury. Root canal therapy and internal bleaching were carried out.
1
R
L
After root
canal therapy
Wound Complications
The osseous genioplasty is completed through an intraoral
vestibular incision.63 To limit wound-healing difficulties,
the incision should be made in the depth of the vestibule.
The maintenance of a thick cuff of mucosa and muscle
tissue adjacent to the cervical margins of the teeth for a
relaxed wound closure in two layers (i.e., muscle and
mucosa) limits wound dehiscence, muscle dysfunction, chin
ptosis, and long-term mucogingival problems. Placing the
soft-tissue incision too high in the vestibule can negatively
affect wound closure, thereby resulting in dehiscence or scar
bands with periodontal sequelae (i.e., mucogingival pull)
(
Videos 11 and 12).
Injury to the Teeth
The location of the chin osteotomy should be based on
the patient’s chin dysmorphology and a review of the radio­
graphs of the anterior teeth. Injury to the teeth at the time
of osteotomy should be an uncommon occurrence. Dental
injury may also occur from the fixation screws. If
a dental injury is sustained, evaluation by the patient’s
dentist, referral to an endodontist, and a discussion between
the surgeon and the patient are essential, because root
canal therapy and other forms of treatment may be indi­
cated (Fig. 16-24).
Suboptimal Facial Aesthetics
Patient dissatisfaction after an osseous genioplasty may
relate to facial aesthetics. This is best avoided by doing the
following:
1. Having a detailed discussion with the patient con­
cerning his or her objectives and reviewing the
patient’s overall pretreatment facial and chin mor­
phology and aesthetics (i.e., the recognition of
any associated dentofacial deformity) as well as
any presenting head and neck dysfunction (e.g.,
lip incompetence, mentalis strain, obstructive sleep
apnea)

527
CHAPTER 16  Complications Associated with Orthognathic Surgery
2. Making sure that there is a clear understanding
between the surgeon and the patient with regard to
the operative objectives and any compromises in
treatment
3. Having the surgeon meticulously execute the proce­
dures with the patient under controlled anesthesia
and
with
competent
assistance
and
proper
instrumentation
4. Having the surgeon perform an objective assessment
and then discussing with the patient the results
achieved and any shortcomings perceived
Conclusions
No matter how accurate the diagnosis, how comprehensive
the approach, and how meticulous the surgical technique,
complications will occur in a small percentage of patients
after orthognathic surgery. Through the discussion of the
spectrum of procedure-specific complications and their bio­
logic basis, informed decisions can be jointly agreed to every
step of the way by the surgeon, the patient, and the patient’s
family.
Patient Education Materials
Coordination of Orthodontics and Orthognathic Surgery
To achieve optimal occlusion and facial aesthetics, individuals with jaw discrepancies benefit from a comprehensive
coordinated orthodontic and surgical approach.
The goals of orthodontics in preparation for jaw surgery will be distinctly different from those of orthodontic
“camouflage” treatment of a skeletal malocclusion. Orthodontic camouflage occurs when your orthodontist attempts  
to pull the upper and lower teeth together even though the jaws are far apart. Over the long term, this may cause
periodontal problems, including the loss of the bone and gingiva surrounding the teeth. In any case, orthodontic
camouflage does not correct the jaw deformity or its associated dysfunctions and facial aesthetic concerns. To fully
evaluate your needs, your surgeon will likely suggest consultation visits with a speech pathologist and an ear, nose,
and throat surgeon. He or she may also recommend evaluation by other medical or dental specialists.
For these reasons, it is important for you to make an educated decision (i.e., orthodontics and jaw-straightening
surgery versus orthodontic camouflage treatment alone) before you begin orthodontic treatment. Attempting to correct
a jaw problem orthodontically with surgery held out as a contingency plan may result in extended orthodontic
treatment time, and it is likely to compromise long-term dental health and facial appearance.
The coordination of orthodontic treatment and jaw surgery from the beginning provides the best opportunity to  
help you to achieve long-term dental (periodontal) health, efficiency of treatment time, and preferred facial aesthetics.  
A benchmark time frame for the achievement of the presurgical goals can be set in advance. After you make the
decision to proceed, you may wish to contact your medical insurance carrier to determine its commitment for the
expected procedures. Our office will work with you toward that end.
For most individuals, good interdigitation of the upper and lower teeth (i.e., occlusion) at the time of surgery requires
that specific orthodontic objectives be met. The presurgery orthodontic goals may include the following:
• The correction of dental rotations, anteroposterior misalignments, spacing, and crowding
• The proper torquing of the anterior teeth to achieve ideal dental inclination
• The closure of extraction spaces (unless this is to be achieved by “segmenting” the jaw during surgery)
• The coordination of the dental arch width (unless this is to be achieved by “segmenting” the jaw during surgery)
• The leveling of the occlusal plane or curve of Spee (unless this is to be achieved by “segmenting” the jaw during
surgery)
Orthodontic appliances (i.e., braces) are necessary for both presurgical and postsurgical tooth movement as well  
as to stabilize the jaws during and after surgery. The orthodontic wire sequence is accomplished by the orthodontist  
at interval visits before surgery. This will preferably end with full-dimensional steel stabilization wires. These passive
surgical wires in each arch (i.e., the upper and lower teeth) will prevent any further movement of the teeth just before
and during surgery.
The stabilizing passive surgical wires will be placed by your orthodontist approximately 2 to 6 weeks before the date of
surgery and only after sufficient presurgical orthodontic objectives are met. Closer to the date of surgery, your
orthodontist will also place interdental hooks on the stabilizing wires to meet surgical and early postsurgical needs.
Continued

528 SECTION 2  Planning, Surgical Technique, & Complications
After the passive surgical wires are in place, your surgeon will obtain the immediate presurgical records, which include
alginate impressions of the teeth, centric bite registration, face-bow registration, and facial measurements. The dental
casts are generally mounted on a semi-adjustable articulator for the completion of surgical planning and splint
construction. Information from the surgical planning will be used during the operation to achieve the most precise
occlusion and preferred facial aesthetics.
Orthognathic surgery is performed in an operating room with the use of general anesthesia. Before surgery, you should
undergo a physical examination by your general physician and obtain necessary laboratory work to ensure your safety.
You will check into the hospital on the morning of your surgery, and the operation will generally take from 2 to  
4 hours, depending on surgical details. The length of hospital stay is generally 1 to 2 nights.
During the initial recovery period, you can expect swelling (especially of the lips and cheeks), and this will be followed
by bruising. The swelling is progressive during the initial 24 to 48 hours after surgery. Nasal congestion,  
a sore throat, and varying degrees of nausea should also be anticipated. Medications are prescribed to limit these
issues. During surgery, the sectioned facial bones are secured back together in their new location with the use of small
titanium plates and screws. The use of these plates and screws is a technical advance that limits the need for wiring
the jaws together. Instead, orthodontic elastic bands will be used intermittently after surgery and for several weeks
after to allow the jaws to comfortably rest together, as needed. The orthodontic elastic bands can be removed at any
time, if need be.
Prescriptions for liquid pain medication and antibiotics will be given for use after you leave the hospital. We will advise
you about maintaining a high-protein blenderized diet, the importance of adequate hydration, and necessary limitations
of your physical activities.
In general, after you leave the hospital, you will be asked to basically remain at home for the initial 2 weeks.
Ambulation (walking) is encouraged, and you may read and complete desk-type work as you wish. Returning to
“basic” office work or school after 2 weeks is the general rule, but you must refrain from physical activities (e.g.,
exercise, sports) for a total of 5 weeks.
Although the initial healing phase will generally take approximately 5 weeks to occur, the completion of the healing
process will require 6 to 12 months. In general, your orthodontist will begin the postsurgical phase of orthodontic
treatment 5 weeks after surgery to maintain the result and to fine-tune your bite. Braces are generally removed within
6 months after surgery, but this will vary in accordance with your individual needs.
As with any operation, certain side effects and complications are possible. Complications specific to orthognathic
surgery may be those related to anesthesia, infection, bleeding, alterations in facial sensibility, injury to adjacent teeth
or bones, relapse of the new jaw position with malocclusion, limited range of lower jaw movement, temporomandibular
(jaw) joint dysfunction, and suboptimal facial appearance. Fortunately, most of these complications are rare; however,
the relative risks for your specific surgery should be discussed and understood before proceeding. A separate and
detailed consent form will also be provided.
Orthognathic (jaw-straightening) surgery in combination with orthodontics will generally move your teeth and jaws into
a new position that is more balanced, functional, and healthy. For a successful outcome, communication is essential.
Your orthodontist and surgeon will work together and respond to your concerns. We look forward to providing the
highest-quality medical, dental, and facial care to you.
Jeffrey C. Posnick, DMD, MD
Director, Posnick Center for Facial Plastic Surgery

529
CHAPTER 16  Complications Associated with Orthognathic Surgery
Consent for Orthognathic Surgery
_____
INSTRUCTIONS
Initial here
This is a document that has been prepared to help your surgeon to educate and inform you about your
orthognathic (jaw) surgery and its risks as well as alternative treatment options. It is important that you
read this document carefully and completely. Please initial each section on each page to indicate that you
have read and understand it. In addition, please sign the consent for surgery on the last page as
proposed by your surgeon.
_____
INTRODUCTION
Initial here
Orthognathic surgery is carried out in conjunction with orthodontic treatment. In general, this is for the
purpose of aligning the teeth, improving the occlusion (bite), and enhancing the facial appearance. For
most patients, the improvement of speech articulation, breathing, swallowing, and ease of lip closure
are additional benefits. Whether or not these would be expected benefits for you should be discussed
with your surgeon.
From start to finish, the process generally requires 1 to 2 years, with the majority of orthodontic treatment
being carried out before the surgical procedure. The braces remain on the teeth at the time of
operation. After surgery, orthodontic treatment continues for the purposes of maintaining the result and
detailing the bite.
As your presurgical orthodontic treatment nears completion, additional dental and facial records will be
taken. Your surgeon will use articulated dental models to simulate surgery and to more precisely
achieve the desired occlusion and facial aesthetics for you in the operating room. From these models,
an acrylic bite wafer (splint) will be made to serve as a guide during surgery for the tooth and jaw
alignment that we hope to achieve.
Orthognathic surgery is performed in a hospital operating room with the use of general anesthesia. The
operation will generally take from 2 to 4 hours, depending on your individual surgical details. The length
of the hospital stay is generally 1 or 2 nights.
Orthognathic surgery is an art and a science, but it is not magic. The procedures are individualized for
each patient, and the results depend on the characteristics and quality of your tissues (i.e., bones,
muscles, skin, teeth, temporomandibular joints, mucosa) and on complicated biologic factors (e.g.,
tissue deficiencies, effects of previous treatments). The best candidates for orthognathic surgery are
those individuals who require and who are interested in making improvements to their occlusion their
long-term dental health, their upper airway (breathing), and their facial aesthetics. These patients are
looking for enhancements in one or more of these areas but do not expect perfection; they have
realistic expectations, they understand the potential risks, and they are psychologically stable.
_____
ALTERNATIVE TREATMENTS
Initial here
Alternative forms of management include not undergoing orthognathic surgery at all or possibly
proceeding with other, more limited surgical options. These alternatives should be understood and
discussed to your satisfaction before proceeding. In some circumstances, individuals may choose an
orthodontic “camouflage” treatment option or restorative dental procedures to alter the occlusion, even
though the skeletal (jaw) deformity will remain. Risks and potential complications are also associated
with these alternative forms of treatment. These are all issues to consider in detail before you select the
option that best suits your overall needs.
_____
RISKS OF SURGERY
Initial here
Every surgical procedure involves a certain amount of risk. An individual’s choice to undergo a procedure
is based on the comparison of the risk to the potential benefit. Although the majority of patients do not
experience the complications detailed below, you should discuss each of these items with your
surgeon. Be sure that you understand the risks, potential complications, and consequences of the
orthognathic and facial procedures that are planned for you.
Continued

530 SECTION 2  Planning, Surgical Technique, & Complications
_____
SURGICAL ANESTHESIA
Initial here
Both local and general anesthesia involve risk. There is a possibility of complications, injury, and even
death from all forms of surgery as well as from surgical anesthesia or sedation. At your request, a
presurgical consultation visit with the anesthesiologist can be arranged to review these issues in detail.
_____
AIRWAY COMPROMISE
Initial here
Compromise of the airway in association with orthognathic surgery may occur: at the time of the
induction of anesthesia; during the surgical procedure; early after surgery before hospital discharge; or
later during convalescence at home. With a skilled and experienced team (i.e., the surgeon, the
anesthesiologist, and the hospital staff), close patient supervision (i.e., by family and friends), and
cooperation after discharge, the risk of airway compromise can be minimized every step of the way.
_____
INFECTION
Initial here
Infection is infrequent after orthognathic surgery. Prophylactic antibiotics that are started just before
surgery and continued during hospitalization and after discharge will be given. If an infection does
occur, additional treatment (e.g., a change in antibiotics, drainage and other procedures) may be
necessary.
_____
SCARRING
Initial here
Although good healing after the surgical procedure is expected, less than ideal healing including
unattractive scars may occur within the skin, the deeper structures, and the mucous membranes.
Additional treatment, including surgical procedures, may be helpful to manage any scarring.
_____
BLEEDING
Initial here
The use of hypotensive anesthesia techniques has greatly diminished the need for blood transfusions
during orthognathic surgery. The decision about when to transfuse will be dependent on a combination
of your physiologic parameters. The need for blood replacement should not be considered a
complication but rather a consequence of the orthognathic procedures in a small percentage of
patients (approximately 5%). In rare instances, excessive hemorrhage may occur that requires either
ligation of the involved blood vessel or selective embolization. Ask your surgeon for more information
about the limited need for blood transfusions during orthognathic surgery.
_____
ALTERATION OF FACIAL SENSIBILITY AS A RESULT OF UPPER JAW SURGERY
Initial here
With upper jaw surgery (i.e., Le Fort I osteotomy), the infraorbital nerve is at risk for injury. As a result, the
skin of the cheek, the side of the nose, the upper lip, the gingiva (gums), and the mucosa of the roof of
the mouth (palate) will have diminished feeling. Gradually over the course of 6 to 12 months, the feeling
improves and generally returns towards normal. This should not be considered a complication but
rather a consequence of the procedure. Ask your surgeon for more information about facial sensory
loss associated with upper jaw surgery.
_____
ALTERATION OF FACIAL SENSIBILITY AS A RESULT OF LOWER JAW SURGERY
Initial here
With lower jaw surgery (i.e., sagittal ramus osteotomies), the inferior alveolar nerve is at risk for injury; with
reshaping of the chin (i.e., osseous genioplasty), the mental nerve is at risk. This will result in diminished
sensation of the lower anterior teeth and gums, the lower lip, and the skin of the chin region. Gradually
over the course of 6 to 12 months, the feeling improves, but it does not fully return to normal. The
degree of permanent diminished sensation and how it is interpreted is unique to the individual and not
entirely predictable. This should not be considered a complication but rather a consequence of the
procedure. In rare cases, lower jaw surgery may result in altered sensation and taste ability of the
tongue (i.e. lingual nerve). Ask your surgeon for more information about facial sensory loss associated
with lower jaw surgery.

531
CHAPTER 16  Complications Associated with Orthognathic Surgery
Continued
_____
INJURY TO TEETH AND BONE
Initial here
During the orthognathic procedures, adequate circulation to each of the dental and bone segments must
be maintained for satisfactory healing. Direct injury to the roots of the teeth or interruption of the
circulation to the bone segments can occur. If so, loss of bone is possible. Injury to the teeth (i.e.,
devitalization) that requires treatment with a root canal is also possible. Additional potential
complications include unplanned bone fractures (i.e., fragmentation), delayed healing, sinus obstruction,
or openings from the roof of the mouth into either the sinus cavity or nose (i.e., fistulas). These are not
common events, but they must be mentioned as possible occurrences.
_____
FIXATION HARDWARE
Initial here
The use of titanium plate and screw fixation has greatly improved the results of orthognathic surgery and
diminished complications such as infection, malocclusion, and relapse. After the jaw bones have healed
in their new locations, the plates and screws are no longer needed. In general, however, they are not
routinely removed. In approximately 5% of individuals, one or more of the plates or screws may
eventually be of concern. If so, these can be removed after healing has occurred. In rare cases, a
fixation screw may injure a tooth. If so, the injured tooth may require root canal therapy or even
extraction.
_____
RELAPSE OF THE NEW JAW POSITION
Initial here
With the use of plate and screw fixation across each osteotomy site, unmanageable degrees of relapse
(i.e., the return of the jaws toward their preoperative locations) have become much less frequent.
Nevertheless, remodeling at the osteotomy sites and of the condylar heads (i.e., the jaw joints) may
occur, especially during the initial 6 to 12 months after surgery. When this happens, varying degrees of
relapse can occur. Suboptimal occlusion that is appreciated early after the operation is also possible. In
some cases, further jaw growth may occur after treatment, which will result in recurrent malocclusion.
Despite the potential for these problems, the need for revision osteotomies (i.e., redo jaw surgery) is
not frequent.
_____
TEMPOROMANDIBULAR JOINT PAIN OR DEGENERATION
Initial here
An individual with a jaw deformity and malocclusion may be at greater than average risk for baseline
temporomandibular (jaw) joint problems (i.e., pain, popping, clicking, locking, and limited range of
motion) as compared with the general population. Orthodontic treatment, restorative dentistry, and
orthognathic surgery carried out to improve occlusion should be considered somewhat unpredictable
with regard to their overall effect on preexisting temporomandibular joint dysfunction. For some,
temporomandibular joint complaints will diminish and function will improve, whereas for others these
issues may worsen or not change at all as a result of treatment (e.g. orthodontics, restorative dentistry,
orthognathic surgery). Progressive condylar (jaw joint) reabsorption (i.e., the melting away of the bone)
is an infrequent cause of relapse after orthodontic treatment and orthognathic surgery. When it does
occur, malocclusion results, and further treatment may be required. Ask your surgeon for more
information about this rare condition (i.e., idiopathic condylar resorption).
_____
FACIAL PAIN
Initial here
Individuals with jaw deformities and malocclusion may be at higher risk for baseline facial pain than the
general population. The effects of jaw surgery should be considered somewhat unpredictable with
regard to their overall effect on facial pain. The changes in occlusion (bite) and altered facial sensation
as a result of the jaw surgery are interpreted differently by each individual. For a small percentage of
patients (approximately 5%), facial pain or discomfort (i.e., dysesthesia) is persistent and bothersome.
Additional treatment or surgery may be possible should facial pain or discomfort persist.

532 SECTION 2  Planning, Surgical Technique, & Complications
_____
DISSATISFACTION WITH FACIAL APPEARANCE
Initial here
An individual may feel dissatisfied with the overall facial appearance achieved after orthodontics and
orthognathic (facial) surgery. Despite your surgeon’s best efforts, on occasion, this type of surgery can
result in visible deformities, loss of function, or structural malposition. You may be disappointed if the
results of treatment (e.g., restorative dentistry, orthodontics, orthognathic and facial surgery) do not
meet your expectations. Additional treatments and procedures may be possible should the results be
suboptimal for you.
_____
FACIAL ASYMMETRY
Initial here
The human face is normally asymmetric. This asymmetry may be in the upper or lower aspects of the
face. It may be in the soft tissues, the skeleton, or both. There can be variations from one side of the
face to the other with regard to the results achieved with orthognathic and facial procedures. Additional
surgery may be possible should the extent of asymmetry be of concern to you.
_____
INTRANASAL SURGERY
Initial here
For some individuals, the shape, position and size of the septum of the nose (i.e., the dividing wall
between the left and right nasal passages) or the inferior turbinates (i.e., specific structures inside the
nose) can interfere with nasal breathing, sinus drainage, or both. When septoplasty (i.e., the removal of
bone and cartilage from the septum) and inferior turbinate reduction (i.e., the removal of part of the
turbinate) procedures are carried out with a goal of improving breathing and sinus drainage, it is
possible that you may experience problems such as bleeding or continued difficulties with the airway
and sinus function. There is also the possibility that the septal surgery will cause a perforation (i.e.
opening) between the nasal passages to develop. Fortunately, occurrences of these complications are
not common. Despite your surgeon’s best efforts, a septoplasty or an inferior turbinate operation may
not fully achieve the desired result. In some cases, additional treatment or surgery may be helpful to
resolve these residual problems.
_____
REMOVAL OF WISDOM AND OTHER TEETH
Initial here
The extraction of teeth is an irreversible process. As with any surgery, there are associated risks. For
example, infection may occur, despite the use of prophylactic antibiotics. Possible damage to adjacent
teeth is another concern, especially for those teeth with large fillings or caps. Numbness or altered
sensations of the teeth, gums, lips, tongue, and chin may occur as a result of the closeness of the
tooth roots to the nerves, which can be bruised or damaged. The incomplete removal of tooth
fragments (i.e., small root tips) may be necessary to avoid injury to vital structures such as the nerves
or the sinus. A sinus opening or perforation that requires further treatment may occur with the removal
of an upper wisdom tooth. Most procedures to remove wisdom teeth are routine. and serious
complications are not expected.
_____
MEDICATIONS
Initial here
Medications, drugs, anesthetics, and prescriptions may cause drowsiness and a lack of awareness and
coordination, which can be increased by the use of alcohol or other drugs. Your surgeon advises you
not to operate any vehicles, automobiles, or other potentially hazardous devices for 4 weeks after
orthognathic surgery and then only after approval is given.

533
CHAPTER 16  Complications Associated with Orthognathic Surgery
CONSENT FOR ORTHOGNATHIC SURGERY
1. I hereby authorize my surgeon, __________, and such assistants as may be selected by my surgeon to perform the
following procedure(s):
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
2. I have received, read, and understand the following information sheets:
• Consent for Orthognathic Surgery
• Coordination of Orthodontics and Orthognathic Surgery
• Patient Instructions for Orthognathic Surgery
3. I recognize that, during the course of the operation, unforeseen conditions may necessitate different procedures than
those listed above. I therefore authorize my surgeon, __________, and my surgeon’s assistants or designees to
perform such other procedures that are in the exercise of professional judgment necessary and desirable. The
authority granted under this paragraph shall include all conditions that require treatment and that are not known to my
surgeon at the time the operation is begun.
4. It has been explained to me that, during the initial healing phase after surgery, I will be using orthodontic rubber
bands (elastics) that position my upper and lower teeth together. I agree to be familiar with how to remove the rubber
bands. I understand that I may remove the rubber bands at any time if I feel the need to do so.
5. I acknowledge that no guarantee has been given by anyone with regard to the results that may be achieved by the
procedures to be carried out.
6. I agree not to use alcoholic beverages and unprescribed drugs, and I have been advised to avoid all sports and water
activities for at least 5 (five) weeks and then to resume them only after approval by my surgeon.
7. I agree not to use nicotine or nicotine products for at least 3 weeks before and 2 weeks after surgery.
8. I consent to the photographing of me (head and neck region) before, during, and after surgery. These photographs
may be used by my surgeon for medical, scientific, or educational purposes now and in the future.
9. I have provided my surgeon, __________, with all of my past and current medical and dental information. I agree to
cooperate completely with all recommendations while I am under my surgeon’s care, and I realize that not doing so
could result in a less than optimal result.
10. I consent to the disposal of any body tissues or medical devices that may be removed.
11. THE FOLLOWING INFORMATION HAS BEEN EXPLAINED TO ME IN A WAY THAT I UNDERSTAND:
• THE PREVIOUSLY DESCRIBED PROCEDURES TO BE UNDERTAKEN
• ALTERNATIVE PROCEDURES AND METHODS OF TREATMENT THAT I HAVE DECIDED AGAINST
• THE SPECIFIC RISKS AND POTENTIAL COMPLICATIONS OF THE PROCEDURES THAT I PLAN TO
UNDERGO
I CONSENT TO THE PROCEDURES AND THE ABOVE LISTED ITEMS (1 THROUGH 11). I AM SATISFIED
WITH THE EXPLANATION GIVEN TO ME.
________________________________________
_____________________
Patient (or Person Authorized to Sign for Patient)
Date
________________________________________
______________________
Witness
Date

534 SECTION 2  Planning, Surgical Technique, & Complications
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