[Rotational instability of the lumbar spine--a three-dimensional motion study using bi-plane X-ray analysis system].

摘要: The purpose of this study is to investigate the rotational instability lumbar spine using bi-plane X-ray analysis system and clarify mechanical etiology instability. following results were obtained. (1) range motion was about 2 3 degrees at each segment in normal spine. significantly large spondylolysis, spondylolisthesis, degenerative spondylolisthesis. (2) flexion-extension correlated other spondylolysis However, antero-posterior other. (3) Instantaneous axis rotation (IAR) located posterior part intervertebral disc L4 vertebra, more posteriorly L5 while IAR anteriorly (4) When trunk twisted, lordotic angle generally decreased, showed scoliotic curvature convex twisted direction. apex L4/5 level. Highly significant increases flexion associated with observed pathological levels