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Saline injection technique to confirm pedicle screw path: a cadaveric study
1Department of Orthopaedic Surgery, Rush Medical College, Rush-Presbyterian St. Luke's Medical Center, Chicago, Illinois, USA.
American Journal of Orthopedics (Belle Mead, N.J.)
|May 30, 1998
Summary
A new saline injection technique accurately confirms pedicle screw placement in 97% of cases. This method aids surgeons in avoiding complications from misdirected pedicle screws.
Area of Science:
- Spinal Surgery
- Orthopedic Biomechanics
- Surgical Navigation
Background:
- Pedicle screw misplacement is a common surgical complication.
- Current methods for confirming pedicle screw path accuracy lack complete reliability.
Purpose of the Study:
- To evaluate a novel saline injection technique for verifying pedicle screw trajectory.
- To assess the accuracy and limitations of this technique in cadaveric specimens.
Main Methods:
- A saline injection test was developed to confirm pedicle drill paths.
- Sixty pedicle paths were analyzed in five fresh frozen cadaveric spines (T-12 to L-5).
- Intentional misdirections were created to assess false-negative rates.
Main Results:
- The saline injection test correctly identified 97% of accurate pedicle drill paths.
- The technique correctly identified 82% of misdirected paths.
- False-negative results occurred in 18% of misdirected cases, primarily superiorly and inferiorly.
Conclusions:
- Saline injection is a valuable adjunct for confirming correct pedicle screw paths.
- The technique demonstrates high accuracy but has limitations, with potential for false negatives.
- Further validation may refine its clinical application in spinal surgery.