INTRADISCAL PRESSURE MEASUREMENTS ABOVE AN INSTRUMENTED FUSION - A CADAVERIC STUDY

被引：268

作者：

WEINHOFFER, SL ^{[1
]}

GUYER, RD ^{[1
]}

HERBERT, M ^{[1
]}

GRIFFITH, SL ^{[1
]}

机构：

[1] TEXAS BACK INST RES FDN,PLANO,TX 75093

来源：

SPINE | 1995年 / 20卷 / 05期

关键词：

BIOMECHANICS; DISC PRESSURE; LUMBAR MOTION;

D O I：

10.1097/00007632-199503010-00004

中图分类号：

R74 [神经病学与精神病学];

学科分类号：

摘要：

Study Design. An in vitro study to determine the in tradiscal 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 instrumental spinal segment compared to an uninstrumented segment. Summary of Background Data. The progressive degefieration 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 S1, and with bilateral pedicle screw-rod instrumentation from F4 to S1. 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 fixatian 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.

引用

页码：526 / 531

页数：6

共 10 条

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