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A comparative biomechanical study of spinal fixation using Cotrel-Dubousset instrumentation
J P Farcy1, M Weidenbaum, C B Michelsen
1Department of Orthopaedic Surgery, Helen Hayes Hospital, West Haverstraw, New York.
Spine
|November 1, 1987
Summary
Cotrel-Dubousset (CD) spinal instrumentation demonstrated superior stability over Harrington and Luque rods in biomechanical tests simulating spinal instability. CD instrumentation
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Spinal Biomechanics
Background:
- Spinal instrumentation aims to restore stability and promote fusion in cases of spinal instability.
- Traditional methods like Harrington and Luque rods have been widely used, but newer systems offer potential advantages.
- Understanding the biomechanical properties of different spinal fixation systems is crucial for surgical decision-making.
Purpose of the Study:
- To compare the axial and torsional stiffness of Cotrel-Dubousset (CD) instrumentation against segmentally wired Harrington distraction rods and Luque rods.
- To evaluate the relative stability of these spinal instrumentation systems under simulated single-level instability.
- To assess the impact of CD instrumentation's specific features (locking hooks, double-hook configurations) on stability.
Main Methods:
- A biomechanical study utilizing a customized spine simulator and bovine thoracic spines (n=13).
- Spines were destabilized via anterior vertebrectomy to create simulated two-column instability.
- Axial and torsional loading were applied to measure stiffness coefficients, with data acquired via a computer system.
Main Results:
- In axial loading, Harrington rods were 26.5% as stable as second-level CD instrumentation, while Luque rods were 18.4% as stable.
- In torsional loading, Harrington rods were 13% as stable as first-level CD instrumentation, and Luque rods were 64% as stable.
- First-level CD instrumentation showed 21.5% axial stability compared to second-level CD instrumentation, and second-level CD instrumentation showed 34% torsional stability compared to first-level CD.
Conclusions:
- Cotrel-Dubousset instrumentation offers enhanced stability compared to traditional Harrington and Luque rod systems.
- The design features of CD instrumentation, including locking hooks and transverse traction devices, contribute significantly to its improved biomechanical performance.
- These findings support the use of CD instrumentation for achieving greater spinal stability in challenging cases.