578
III.11 TRUNK: BACK
The latissim us dorsi m uscle ap is one of the m ost
widely applicable and reliable free tissue aps, with a
long pedicle and large diam eter of the dominant ves-
sels. Because its neurovascular anatomy is quite con-
stant, the ap can be easily isolated. This is a large ap
and it provides a large amount of soft tissue.
Clinically, there is no notable residual functional
problem from loss of the latissimus dorsi (because of
the compensatory action of the teres major and pec-
toralis m ajor), but the procedure should be used pru-
dently for the patient on crutches.
The latissimus dorsi muscle or myocutaneous ap
is widely used in microsurgical reconstruction. Its indi-
cations have been reported as follows:
1. Treatment of chronic osteomyelitis
2. Functional repair of m uscles in the upper extremity
3. Reconstruction of the breast after cancer surgery
4. Restoration of the thoracic or abdom inal wall
5. Reanimation of facial palsy
6. Reconstruction of defects of the cervical thoracic
esophagus by tubed myocutaneous ap after cancer
resection
7. Release of post-burn scar contracture in the neck
and axilla
8. Cardiomyoplasty with wrapping of the heart in pa-
tients with congestive heart failure to improve ven-
tricular contraction
The bilobed split latissimus ap provides two aps
that can be used sim ultaneously. The lateral or medial
split ap can be transferred as a smaller muscle or my-
ocutaneous ap, preserving the function of the latis-
simus dorsi to a certain extent, with the intact half of
the muscle.
The rib–latissim us dorsi osteomyocutaneous ap
can be applied in reconstruction of a compound bony
defect of the extremities; however, for bony defects of
the tibia or femur, the ap should include two ribs. It
can also be used as an island transfer in reconstructions
of mandibular defects. (For a description of the proper-
ties of rib, refer to Chapter 9 on free costal bone graft.)
With the angular artery, the latissimus dorsi ap
can combine with a lower lateral portion of the scapula
as a revascularized bone graft. This osteomuscular ap
has been reported mostly for its use in bone loss with
skin defect in the leg caused by traum a or after surgery
for osteomyelitis.
The latissimus dorsi osteomyocutaneous ap with
scapula or with rib, or with both, has been used for fa-
cial reconstruction at the infraorbital rim and hard
palate after surgical ablation of malignant tumor. The
rib–latissimus dorsi ap is also reported for lengthen-
ing of short lower-leg stumps after below-knee ampu-
tation to improve ambulation with prosthesis.
The ap can also be combined with the serratus an-
terior, scapular, or parascapular ap, using one vascular
pedicle of the subscapular vessels. However, the ap is
too bulky to be used in such sites as the hand. In addi-
tion, the skin of the myocutaneous ap does not have
sensibility, and this ap is not recommended for use on
the weight-bearing parts of the heel and sole.
There are methods of mitigating the bulkiness of the
ap: the lateral or medial split latissimus dorsi ap pro-
duces less bulk; the muscle ap with skin graft is much
thinner than the myocutaneous ap; and, in addition, the
volume of muscle in a noninnervated muscle ap will at-
rophy ~25 to 50%. Furthermore, the muscle ap can also
be thinned of one-third its thickness by resection of the
super cial layer because the thoracodorsal neurovascular
bundle and its branches consistently remain on the deep
surface of the muscle for their entire course.
However, the best technique to avoid the bulkiness
of the latissimus dorsi ap is to consider a TAP ap. The
sensate myocutaneous or TAP ap can be fabricated by
using the seventh or eighth lateral cutaneous branch of
the intercostal nerve, or the seventh or eighth lateral
cutaneous branch of the dorsal thoracic nerve, both of
which generally supply the m iddle portion of the skin
ap. Nevertheless, results in sensory recovery still need
continual evaluation by further clinical trials.
During dissection of the neurovascular pedicle in
the axillary fossa, extreme abduction of the arm should
be avoided. Failure to attend to this warning m ay cause
the posterior bow of the clavicle to impinge on the up-
per trunk of the brachial plexus against the cervical
spine, resulting in transient weakness and sensory
changes in the ipsilateral upper extremity.
COMMENT AND INSIGHTS
LATISSIMUS DORSI MUSCLE FLAP
579
LATISSIMUS DORSI MUSCLE FLAP
Incision (Fig. 11–7)
The patient is placed on the side, with the donor side
upward and the shoulder joint abducted. An incision is
m ade from the posterior axillary fold, running pos-
teroinferiorly toward the loin, 3 to 5 cm posterior to the
lateral margin of the muscle. The length of the incision
accords with the size of the m uscle ap required. At
times, a small skin island is designed, remaining on the
muscle as a monitor for the integrity of the circulation.
Figure 11–7
Incision.
1. Latissimus dorsi m.
2. Serratus anterior m.
3. Teres major m.
4. Rhomboid major m.
5. Infraspinatus m.
6. Axillary a. and v.
7. Subscapular a. and v.
8. Thoracodorsal a., v., and n.
9. Circum ex scapular a. and v.
10. Branch to serratus anterior
11. Serratus posterior inferior m.
12. Intercostalis externus m.
13. Pectoralis major m.