当你上体前屈时，脊椎向前移动，但骨盆和骶骨却要保持在原处，特别是屈膝的一侧。
As you begin to bend forward, the spine moves while the pelvis and sacrum tend to remain behind, especially on the side with the knee drawn back.
本文研究了悬臂矩形板受均布载荷或集中载荷作用时的侧屈问题。
The present article researches the problems of the lateral instability of cantilever rectangular plates under a concentrated force or a uniformly distributed load respectively.
以包括过屈过伸的侧位放射平片和CT精细扫描三维重建进行随访，平均22个月（11-30个月）。
Follow-up averaged 22 months (range, 11-30 months). All were studied with plain radiographs, including flexion-extension lateral films and fine cut CT scans with reconstruction.
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