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Sacral fixation technique in lumbosacral fusion
D O Stovall1, J A Goodrich, D Lundy
1Division of Orthopaedic Surgery, Medical College of Georgia, Augusta, USA.
Spine
|January 1, 1997
Summary
Adding sacral foraminal hooks to standard S1 pedicle screws significantly increases the bending stiffness of lumbosacral fixation. This modified construct offers more rigid stabilization for spinal fusion procedures.
Area of Science:
- Orthopedic surgery
- Spinal biomechanics
- Biomedical engineering
Background:
- Spinal instrumentation constructs rely on rigidity for successful fusion.
- Understanding biomechanical properties is crucial for optimizing spinal fusion outcomes.
Purpose of the Study:
- To evaluate a modified sacral fixation technique.
- To assess the biomechanical impact of using first dorsal sacral foramina for hook placement alongside S1 pedicle screws.
Main Methods:
- Servohydraulic load displacement testing on 16 human cadaveric specimens.
- Two groups: S1 pedicle screws alone vs. S1 pedicle screws with sacral foraminal hooks.
- Testing under anterior compressive flexion to record load displacement curves.
Main Results:
- The construct with added sacral foraminal hooks demonstrated significantly higher bending stiffness.
- No significant difference was observed in ultimate strength or energy absorbed between the groups.
Conclusions:
- The addition of sacral foraminal hooks enhances the rigidity of sacral fixation.
- This modified technique provides more stable stabilization for the lumbosacral motion segment.