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Biomechanical alterations induced by multilevel cervical laminectomy
J F Cusick1, F A Pintar, N Yoganandan
1Department of Neurosurgery, Medical College of Wisconsin, Milwaukee, USA.
Spine
|November 15, 1995
Summary
Multilevel cervical laminectomy significantly increases cervical spine flexibility and rotation. These biomechanical changes may explain why laminectomy sometimes fails to provide lasting relief for cervical myelopathy.
Area of Science:
- Orthopedics
- Biomechanics
- Spine Surgery
Background:
- Previous studies on cervical laminectomy showed minimal changes in strength or flexibility.
- Limitations included pure loads, limited laminectomy levels, and small sample sizes.
Purpose of the Study:
- To investigate the biomechanical effects of multilevel cervical spine laminectomy.
- To use an in vitro model that better replicates clinical conditions.
Main Methods:
- Twelve human cadaver cervical spine segments (C2-T1) were tested.
- Flexion-compression loads were applied before and after a three-level laminectomy (C4-C6).
- Kinematics and forces were measured at each spinal level.
Main Results:
- Laminectomized specimens showed significantly greater stiffness reduction (P < 0.05) compared to intact specimens.
- Sagittal rotation increased significantly from 3.6° (intact) to 8.0° (laminectomy) (P < 0.05).
- Increased rotation was observed at all levels, particularly below the laminectomy site.
Conclusions:
- Multilevel cervical laminectomy leads to increased spinal flexibility and sagittal rotation.
- These biomechanical alterations may contribute to suboptimal long-term outcomes for cervical myelopathy.
- The findings suggest a potential basis for the limited sustained therapeutic benefits of laminectomy in certain spinal conditions.