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KMID : 0361619920270041161
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Journal of the Korean Orthopaedic Association
1992 Volume.27 No. 4 p.1161 ~ p.1171
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A Photoelastic analysis of stree distribution in the lower lumbar spine with relation to the elevation of one leg
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안면환
정해훈/추도식/안종철/인주철/황재석/권재도/최영철
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Abstract
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In order to observe the alteration of stress distribution in the lower lumbar spine with relation to various postural parameters, such as in elevation of one leg low to 1/3 leg-length height, with or without one foot placed forward and 2/3
leg-length
height, a photoelastic analysis was performed with a 2-dimensional epoxy model. According to the lateral views of the lumbar spine and pelvis in 15 young males without low back pain all radiological parameters that was mentioned by During, were
decreased by the elevation of one leg, but they were not related to its degree of elevation. Thus, the case with a median value of the pelvic tilt angle among the 15 cases in a normal standing posture and the another case with one leg elevated to
1/3
leg length height were selected for the the epoxy model to observe the changes of stress distribution with relation to postural changes. Cases with the maximum and minimum values of the pelvic tilt angle were selected to observe the alteration
with
relation to the various pelvic tilt angles in the normal standing posture. Composite epoxy models were specially designed with epoxy and glass-fiber corresponding to the cortical and cancellous bone in the human vertebrae.
@ES The results were as below:
@EN 1. Pevic tilt angle was decreased according to the elevation of unilateral leg, but was not related to it's degree of elevation or foreward pacement of a foot.
2. Photoelastic analysis in the case of leg elevation showed even distribution in the whole verebral body comparing with the stress distribution in the standing posture, furthermore stresses tended to be more concentrated to the andterior
portion
than
the posterior portion of the spinal column.
3. Photoelastic analysis in the case of normal standing posture showed that the maximal stress point moved foreward to anterosuperior part of spinal element with increment of pelvic tilt angle but, showed that stresses were evenly distributed
to
the
anterior and posterior portion in the one vertebral body of the lumbar spine.
4. Photoelastic analysis according to the variation of lumbosacral angle showed that the maximal stress point moved backward to the posterior portion of the vertebral body from anterosuperior part of the spinal element according to the increment
of the
lumbosacral angle.
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KEYWORD
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