Title: A MECHANICAL STUDY ON THE DEVELOPING FACTORS OF SPONDYLOLYSIS-ACCORDING TO THE DEFORMATION OF HUMAN LUMBAR VERTEBRAE UNDER LOADING
Abstract:There are still many unknown causative factors found in the development of spondylolysis. We have been investigating the disorders of the lumbar region in athleticly inclined people and have found the...There are still many unknown causative factors found in the development of spondylolysis. We have been investigating the disorders of the lumbar region in athleticly inclined people and have found the occurrence of spondylolysis to be by significantly high. The mechanical breakdown of the pars interarticularis is thought to be one of the causative factors of spondylolysis. In order to study this theory, a deformed lumbar vertebrae of cadavers were experimentally analyzed and checked under loading. This loading test was done on the isolated vertebrae, the spinal functional unit (involving the lumbar vertebral disc) and the spinal column. The amount of deformity was measured at each portion of vertebral body, vertebral disc (anterior, lateral and posterior site) and pars interarticularis. A displascement transducer designed originally for this test was used. The result was that the contrasting deformities such as compression and tension were operated on the pars interarticularis of the fifth lumbar vertebrae at the extended and neutral positions of spinal column.Under maximum loading (167kg⋅f), the amount of deformity in the pars interarticularis was 73 μm/10mm in neutral position and 67μm/10mm in extension. The direction of the deformity was tension in neutral position and compression in extension position. These results suggested that there is a possibility that there is material fatigue in the pars interarticularis by ordinary motion of the lumbar spine without any excessive or established conditions such as concentrating the stress to the pars interarticularis, and so developing to spondylolysis.Read More
Publication Year: 1979
Publication Date: 1979-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 2
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