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Single versus separate registration for computer-assisted lumbar pedicle screw placement
Tao-Chen Lee1, Lin-Cheng Yang, Po-Chou Liliang
1Department of Neurosurgery, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung, Taiwan. leetc@adm.cgmh.org.tw
Spine
|July 13, 2004
Summary
Separate registration during computer-assisted lumbar spinal instrumentation significantly reduces pedicle screw misplacement compared to single registration. This method enhances accuracy, crucial for preventing complications like nerve root injury.
Area of Science:
- Neurosurgery
- Orthopedic Surgery
- Medical Imaging
Background:
- Computer-assisted spinal instrumentation improves pedicle screw accuracy but still has a 2.7%–8% perforation rate.
- Potential causes for pedicle screw misplacement include changes in lumbar lordosis between preoperative CT scans and surgery.
Purpose of the Study:
- To evaluate the efficacy of single versus separate registration in pedicle screw accuracy.
- To determine if separate registration reduces lumbar pedicle screw misplacement.
Main Methods:
- Retrospective study of 47 adult patients undergoing computer-assisted lumbar spinal instrumentation.
- Pedicle screw accuracy assessed using postoperative radiographs and CT scans.
- Comparison between single-level registration (22 patients) and multi-level registration (25 patients).
Main Results:
- Separate registration resulted in 90% good and 10% fair pedicle screw placements, compared to 72% good, 24% fair, and 4% poor in the single registration group.
- The difference in placement accuracy was statistically significant (chi2, P = 0.0003).
- Poorly placed screws in the single registration group were associated with high-mobility spinal segments and caused one root injury.
Conclusions:
- Separate registration at each instrumented level enhances pedicle screw placement accuracy in traditional computer-assisted lumbar spinal instrumentation.
- This technique is recommended prior to the widespread adoption of intraoperative real-time CT imaging.
- Improved accuracy minimizes the risk of complications such as nerve root injury.