Hilton R C, Ball J, Benn R T
Ann Rheum Dis. 1979 Aug;38(4):378-83. doi: 10.1136/ard.38.4.378.
As part of a systematic study of the spine between D11 and S1 the response to stress has been assessed by measuring radiologically the total and segmental mobility of 103 specimens. The method was shown to be reproducible to within 10% of total mobility. No significant sex difference was seen. Total mobility varied widely, but mean total mobility fell with age. All lumbar segments became less mobile up to the fifth decade. Between the fifth and the eighth decade the mobility of the fifth lumbar segment continued to fall, whereas other lumbar segments became more mobile. The mobility of each segment also varied widely, but the mean segmental mobility fell progressively from L5 to D11. However, this smooth pattern of movement was seen in only 16 cases, mostly adolescents and young adults. Among the remainder, in which movement was irregularly distributed, there were 7 cases (4 aged less than 30 years) in which the mobility of at least 1 segment was more than 2 standard deviations above the mean. The cause of this hypermobility was not evident radiologically. It is suggested that segments with abnormally high mobility may be at risk.
作为对胸11至骶1脊柱的系统研究的一部分，通过放射学测量103个标本的整体和节段活动度来评估对应力的反应。该方法的可重复性在整体活动度的10%以内。未观察到明显的性别差异。整体活动度差异很大，但平均整体活动度随年龄下降。所有腰椎节段在50岁之前活动度均降低。在50岁至80岁之间，第5腰椎节段的活动度继续下降，而其他腰椎节段的活动度则增加。每个节段的活动度也差异很大，但平均节段活动度从腰5至胸11逐渐降低。然而，这种平滑的运动模式仅在16例中出现，大多为青少年和年轻人。在其余运动分布不规则的病例中，有7例（4例年龄小于30岁）至少1个节段的活动度高于平均值2个标准差以上。这种活动度过高的原因在放射学上并不明显。提示活动度异常高的节段可能存在风险。
