双侧峡部裂对腰椎稳定性影响的实验研究

目的：研究双侧峡部裂对腰椎三维稳定性的影响。方法：实验材料为８具成人新鲜腰椎标本，切断Ｌ２双侧峡部，通过脊柱三维运动试验机，对标本施加前屈／后伸、侧弯和轴向旋转等６种力偶矩（１０Ｎ．ｍ），由脊柱三维运动分析系统得到腰椎节段的运动范围。结果：双侧峡部断裂后，腰椎前屈／后伸及左／右旋转运动范围分别增加２６．６％、５５．９％、１００．９％、１１５．８％，较正常标本有显著性增大，而左／右侧弯变化不大。结论：峡部对腰椎三维稳定具有重要的力学作用，双侧峡部裂导致腰椎不稳。

An experimental study on the stability of spondylolysis lumbar spine

Objective:The experiment was designed to evaluate the three dimensional stability of spondyloic lumbar spines.Methods:Eight fresh adult human lumbar specimens were tested with a three dimensional spinal motion test machine,with the maximum loading of 10.0N.m.Three dimensional movements were measured in intact state and spondylolysis.Results:The results showed that the ranges of motions of the spondylolic spines increased significantly compared with intact spines in flexion,extension and axial rotation.Conclusions:The data demonstrated that pars interarticularies played a very important role in the stabilization of the lumbar spine.