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We would like to present a case with an anatomical
anomaly of the lumbar spine, which made it difficult to insert pedicle
screws. This patient is a 75 year old
male who has had low back pain and both leg pain for years. Imaging studies showed Grade 1 degenerative
spondylolisthesis and severe spinal stenosis at L4-5. He underwent open transforaminal lumbar inter
body fusion at L4-5.
Pedicle screw fixation is a basic instrumentation
procedure for lumbar spinal fusion surgery.
Many of the spine surgeons perform pedicle screw insertion using
free-hand technique. When performing
free-hand technique, one of the important landmarks of the entry point of
pedicle screw is the transverse process. Midpoint of the transverse process is
used as the rostral-caudal landmark of the entry point.
During the surgery, we tried to dissect the
transverse process as the landmark of the pedicle screw and for the
posterolateral fusion. We usually think
transverse process of lumbar spine is large enough to palpate during
dissection. However, we could find very
small left L5 transverse process. In
addition, we found that the location of right L5 transverse process is very far
from L4/5 facet joint. Due to this
unusual anatomy, we decide to insert L5 pedicle screws under fluoroscopy and
those screws were placed at the proper position.
Retrospectively looking at the AP view of lumbar
spine, right L5 transverse process is much smaller than right L4 transverse
process (Figure 1). Actually, that small transverse process was
even masked by hypertrophied L4-5 facet joint during dissection. X-ray also shows abnormal shape of left L5
transverse process.
Learning points from this case:
- We need to
check the morphology and location of transverse process with AP view when
performing free-hand pedicle screw insertion.
- Fluoroscopic
pedicle screw insertion is an alternative method when we find unusual
anatomy.
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