下位腰椎システムの有限要素応力解析

概要

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Extension, Flexion and axial rotation of spinal motion segments are analyzed to investigate the cause of spondylolysis which is observed frequently in the fifth (L5) and fourth (L4) lumbar vertebrae. A finite element model of a system of lower lumbar vertebrae including the related intervertebral discs and ligaments is constructed. Parts of the sacrum and ilium and the third lumbar vertebra (L3) are also added to the system to realize appropriate boundary conditions. The displacements of the sacrum are constrained, and uniform pressure is applied to the upper surface of L3 to take into account body weight and self-equilibrium force. In addition to these, a bending moment for extension or flexion, or a rotation moment for axial rotation is applied to L3. The results of the analyses show that stress concentration is observed at the interarticular portion of L5 and L4 in all motions. In particular, high stresses occur in L5 in the case of extension. The stresses in flexion are also marked in L5 and L4, but the values are significantly affected by the rigidities of the interspinous and supraspinous ligaments and the capsules.
一般社団法人日本機械学会の論文
1996-08-25