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The Effect of Flexion-Extension Motion of the Lumbar Spine on the Capacity of the Spinal Canal

1989; Lippincott Williams & Wilkins; Volume: 14; Issue: 5 Linguagem: Inglês

10.1097/00007632-198905000-00009

1528-1159

DAI LIYANG, XU YINKAN, ZHANG WENMING, ZHOU ZHIHUA,

Spinal Fractures and Fixation Techniques

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 < 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.