脊椎分離すべり症の生体力学的要因に関する計算力学的検討

概要

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This study is concerned with biomechanical evaluations of isthmic spondylolisthesis that causes slippage of a defected vertebra. Because the frequency of this disease depends on the site of spondylolysis, it is supposed that the mechanical boundary condition in lower lumbar spine has influence on isthmic spondylolisthesis. To clarify the mechanism of isthmic spondylolisthesis, the effects of isthmic defect on stress distribution in intervertebral disks were investigated by using a three-dimensional finite element model of a whole spine. The results of extension motion analyses show that the maximum compressive principal stress of L4-L5 disk in L4 defect model is significantly increased in comparison with that of an intact model and the instability of the defect vertebra is also increased. Such a high compression on the disk may cause disk degeneration which leads to spondylolisthesis.
一般社団法人日本機械学会の論文
2004-04-25