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Accuracy of cortical bone trajectory screw fixation guided by spinous process clamp guide in lumbosacral vertebrae:
Xi-Nuo Zhang1, Li-Jin Zhou1, Qing-Jun Su1
1Department of Orthopedic Surgery, Beijing Chao-yang Hospital, Capital Medical University, Beijing, China.
Background:
The purpose of this study was to access the accuracy of cortical bone trajectory screw placement guided by spinous process clamp (SPC).
Methods:
Eight formalin-treated cadaveric lumbar specimens with T12-S1 were used. A total of 96 screws were implanted in eight lumbar specimens.
Results:
In the freehand (FH) group, clinically acceptable placement (grade A and B) was 40 screws (83.3%), meanwhile 44 screws (91.7%) in the SPC guide group (p = 0.217). The grade A screws in the SPC guide group were much more than that in the FH group (n = 40 vs. n = 31, p = 0.036). The misplacement screws (grade C, D, and E) and proximal facet joint violation (FJV) in the SPC group was comparable to the FH group.
Conclusions:
This cadaveric study demonstrate that implanting CBT screws guided by SPC guide was more accuracy and reduces severe deviations in important directions.
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