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Biomechanical analysis of lumbosacral fixation
P A Glazer1, O Colliou, J C Lotz
1Department of Orthopaedic Surgery, University of California, San Francisco, USA.
Spine
|May 15, 1996
Summary
This study compared posterior and anterior spinal fixation systems for lumbosacral junction stability. The threaded interbody fusion device demonstrated effectiveness for immobilization and enhancing fixation rigidity.
Area of Science:
- Spinal biomechanics
- Orthopedic surgery
- Spinal fusion techniques
Background:
- Current posterior spinal instrumentation lacks comprehensive stability testing with anterior interbody fixation.
- Hypothesis: Anterior interbody fixation techniques can enhance lumbosacral junction rigidity.
Purpose of the Study:
- To determine optimal spinal instrumentation for lumbosacral junction stability.
- Evaluate combined anterior and posterior fixation systems.
Main Methods:
- Tested two posterior and three anterior fusion constructs in cadaveric specimens.
- Assessed construct stiffness under axial compression, torsion, flexion, and extension.
Main Results:
- Posterior instrumentation yielded greater stiffness than anterior constructs.
- Jackson instrumentation superior to Galveston in torsion and flexion.
- Threaded interbody fusion device was the stiffest anterior construct in axial torsion.
Conclusions:
- The threaded interbody fusion device shows promise for L5-S1 disc space immobilization.
- Appropriate anterior interbody techniques can significantly enhance lumbosacral fixation rigidity.