第5,第4腰椎単体の有限要素応力解析

概要

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Separation of an interarticular portion of human vertebra, or spondylolysis, is often observed in the fifth (L5) and the fourth (L4) lumbar vertebra. The present study investigates Spondylolysis from a mechanical point of view. For this purpose, finite element models of L5 and L4 are constructed by reproducing the shape of typical vertebral specimens of a 44-year-old man as accurately as possible. Then the upper and the lower surface of the vertebral disk are constrained, and constant loads are applied to the inferior facet faces of L5 and L4 in various directions. The dependence of the maximum principal stress in the interarticular portion on the load direction and the point of load application is discussed. The results show that the maximum principal stress in the interarticular portion in L5 is higher than that in L4 in most cases. This result agrees with the clinical observation that 80% of spondylolysis occurs in L5. It is also observed that the principal direction of maximum stress in the interarticular portion is Independent of the direction of the applied load, and is perpendicular to the surface of the separation observed clinically.
一般社団法人日本機械学会の論文
1996-08-25