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Preoperative CT determination of angles for sacral screw placement
B J Morse1, N A Ebraheim, W T Jackson
1Department of Orthopaedic Surgery, Medical College of Ohio, Toledo.
Spine
|March 1, 1994
Summary
Sacral screw placement for spinal fusion requires careful consideration of patient anatomy. Using average angles risks damaging vital structures, necessitating individualized pre-operative CT scans for safe screw placement.
Area of Science:
- Spinal surgery
- Orthopedic surgery
- Anatomy
Background:
- Rigid fixation of the lumbosacral spine relies on sacral screw placement.
- Patient-specific sacral morphology variations complicate safe screw insertion.
Purpose of the Study:
- To evaluate the safety and accuracy of using average angles for sacral screw placement.
- To propose an individualized approach for sacral screw fixation.
Main Methods:
- Computed tomography (CT) analysis of S1 pedicle and sacral ala in 10 cadavers.
- Placement of screws at average angles and verification via CT.
- Assessment of anatomical landmark violations.
Main Results:
- Average angles for sacral screw placement were established.
- Four out of ten specimens showed violation or near-violation of critical anatomical landmarks.
- Risk of injury to vital structures identified with average angle placement.
Conclusions:
- Placement of sacral screws using average angles poses significant risks.
- Individualized preoperative CT evaluation is recommended to determine safe screw trajectories.
- Personalized surgical planning enhances patient safety in lumbosacral instrumentation.