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Abstract
Study Design
Retrospective study Objective:To evaluate the factors affecting metal failure and screw loosening of short-segmental (1- or 2-segmental) monoaxial or polyaxial screw fixation for degenerative lumbar disease.
Summary of Literature Review
There was a report on metal failure and screw loosening in short-segmental monoaxial and polyaxial screw fixation in degenerative lumbar disease.
Materials and Methods
This study examined 227 cases who underwent short-segmental transpedicular screw fixation and vertebral fusion for a degenerative lumbar. (Ed note: You need to define groups A and B.)
Results
Metal failure of transpedicular screws was detected in 6 cases, 3 each in groups A and B. Screw loosening occurred in 16 and 43 cases in group A and B, respectively. Both groups had a similar incidence of spinal stenosis with instability and spondylolisthesis. The failure rate and screw loosening according to the fusion level was also similar. The failure and screw loosening rates was higher in the cases who did not undergo PLIF than in the cases who underwent PLIF but the difference was not statistically significant.
REFERENCES
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Fig. 1.
59-year-old patient with spinal stenosis of the lumbar spine. A continuous lucency at the screw-bone interface surrounded by a thin radiolucent zone (halo sign-black arrows) on the AP radiograph indicates loosening of both distal screws on 4 months follow up.
Fig. 2.
62-year-old patient with spinal stenosis shows pull-out (black arrow) of screws from the vertebral body due to increase of kyphosis of the lumbar spine on 4 months (A) and 10 months (B) follow up.
Fig. 3.
67-year-old patient with spinal stenosis shows screw-rod dissociation on 2 months follow up.
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