Intradiscal pressure measurements above an instrumented fusion. A cadaveric study
Weinhoffer, S.L.; Guyer, R.D.; Herbert, M.; Griffith, S.L.
Spine 20(5): 526-531
1995
ISSN/ISBN: 0362-2436 PMID: 7604320 Document Number: 449443
Study Design: An in vitro study to determine the intradiscal pressure changes during flexion in levels above a simulated fusion was performed. Objectives: To determine if intradiscal pressure increases more during flexion in discs above an instrumented spinal segment compared to an uninstrumented segment. Summary of Background Data: The progressive degeneration of intervertebral discs adjacent to a fused or fixed segment is a phenomenon that is noted but poorly understood. Intuitively, the degeneration appears to be a function of altered biomechanics of the motion segments in the spine. Methods: Two intervertebral disc levels were evaluated, L3-L4 and L4-L5 from each of six fresh frozen cadaver spines. Pressure measurements were taken with the spine uninstrumented, with bilateral pedicle screw-rod instrumentation from L5 to Sl, and with bilateral pedicle screw-rod instrumentation from L4 to Sl. Pressure measurements were accomplished with Millar Mikro-Tip pressure transducers. The transducers were placed within the nucleus pulposus of L3-L4 and L4-L5 intervertebral discs. Pressure data were recorded by computer data, acquisition. The pressure data were compared by intervertebral level and by the effects of added instrumentation. Results: In general, the addition of instrumentation significantly affected the intradiscal pressure in the levels above a simulated fusion. The intradiscal pressure increased as the amount of levels involved in the simulated fusion increased. The intradiscal pressure increased as flexion motion increased. A greater increase was seen at the L4-L5 level than the L3-L4 level. When L5-S1 fixation was added, the intradiscal pressure increased. When L4-S1 fixation was added, the intradiscal pressure further increased. Conclusion: This study demonstrated increasing intradiscal pressures during flexion.