圧縮荷重下における腰椎の応力分布

概要

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A stress analysis of a human lumbar motion segment (L3-L4) containing two adjacent vertebrae and the intervertebral disc under compression was carried out using the finite element method. In the plane model traced precisely from an X-ray photograph, the five substructures were incorporated: each of the vertebral bodies, the annulus fibrosus, the nucleus pulposus, the anterior and the posterior ligaments. As a result, for a lumbar segment with a healthy disc, the region of highest stresses in the cortical bone was found at the center of the vertebral end plate in contact with the nucleus pulposus and at the posterior wall of the lower vertebral body. In addition, below the nucleus pulposus to the posterior wall of the lower vertebral body, the weakest region was observed in the cancellous bone. Therefore, the mechanism of burst fracture at a lumbar spine was estimated from this analysis.
社団法人日本機械学会の論文
1989-05-25