Dai L Y, Xu Y K, Zhang W M, Zhou Z H
Department of Orthopaedics, Changzheng Hospital, Shanghai, China.
Spine (Phila Pa 1976). 1989 May;14(5):523-5.
The symptoms of lumbar spinal stenosis are often posture-dependent, and it is generally accepted that the capacity of the spinal canal is affected by flexion-extension motions of the lumbar spine. A study of spinal capacity in flexion-extension of ten cadaver specimens on the lumbar spine was done and measurements were obtained from the flexion-extension lateral myelograms. There proved to be a larger capacity of dural sac of 3.5 to 6.0 ml (4.85 +/- 0.75 ml) in flexion than in extension, and the differences were highly significant (P less than 0.001). In addition, the sagittal diameter of the dural sac and the length of the spinal canal increased from extension to flexion. Because of the effect of flexion-extension motion of the lumbar spine on the spinal capacity, we suggest that maintaining the lumbar spine in flexion is more suitable since spinal canal capacity is enlarged and symptoms may be mitigated.
腰椎管狭窄症的症状通常与姿势有关，人们普遍认为腰椎的屈伸运动会影响椎管容量。对十个腰椎尸体标本的屈伸过程中的椎管容量进行了研究，并从屈伸侧位脊髓造影中获取了测量数据。结果证明，硬膜囊在屈曲时的容量比伸展时大3.5至6.0毫升（4.85±0.75毫升），差异非常显著（P＜0.001）。此外，硬膜囊的矢状径和椎管长度从伸展到屈曲时增加。由于腰椎屈伸运动对椎管容量的影响，我们建议保持腰椎处于屈曲状态更合适，因为此时椎管容量增大，症状可能会减轻。
