Endo Kenji, Suzuki Hidekazu, Nishimura Hirosuke, Tanaka Hidetoshi, Shishido Takaaki, Yamamoto Kengo
Department of Orthopedic Surgery, Tokyo Medical University, 6-7-1 Nishishinjuku, Shinjuku-ku, Tokyo 160-0023, Japan.
J Orthop Sci. 2012 Nov;17(6):682-6. doi: 10.1007/s00776-012-0281-1. Epub 2012 Aug 23.
The sitting position has become the most common posture in today's workplace. In relation to this position, kinematic analysis of the lumbar spine is helpful in understanding the causes of low back pain and its prevention.
In this study, we investigated the relationship between sagittal lumbar alignment and pelvic alignment in the standing and sitting positions for 50 healthy adults. Lumbar lordotic angle (LLA), sacral slope (SS), pelvic tilt (PT), and pelvic incidence (PI) were measured on lateral lumbar spine standing and sitting radiographs.
Regarding changes from the standing to sitting positions, average LLA, SS, and PT were -16.6° (-49.8 %), -18.7° (-50.3 %), and 18.3° (284.8 %), respectively (P < 0.01). In the sitting position, lumbar lordosis was reduced and pelvic rotation became posterior.
This study showed that LLA decreased by approximately 50 % and PT increased by approximately 25 % in the sitting position compared with the standing position. No significant gender differences were observed for LLA, SS, and PT in the standing position. In the sitting position, however, LLA and SS were markedly larger for women.
坐姿已成为当今工作场所最常见的姿势。针对这种姿势，腰椎的运动学分析有助于理解腰痛的成因及其预防。
在本研究中，我们调查了50名健康成年人在站立位和坐姿时腰椎矢状位排列与骨盆排列之间的关系。在腰椎侧位站立和坐姿X线片上测量腰椎前凸角（LLA）、骶骨倾斜度（SS）、骨盆倾斜度（PT）和骨盆入射角（PI）。
从站立位到坐姿的变化方面，平均LLA、SS和PT分别为-16.6°（-49.8%）、-18.7°（-50.3%）和18.3°（284.8%）（P<0.01）。在坐姿时，腰椎前凸减小，骨盆旋转变为后倾。
本研究表明，与站立位相比，坐姿时LLA降低约50%，PT增加约25%。站立位时，LLA、SS和PT未观察到显著的性别差异。然而，在坐姿时，女性的LLA和SS明显更大。
