Pan Fumin, Zander Thomas, Reitmaier Sandra, Bashkuev Maxim, Schmidt Hendrik
Julius Wolff Institute, Charité - Universitätsmedizin Berlin (corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health), Germany.
Julius Wolff Institute, Charité - Universitätsmedizin Berlin (corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health), Germany.
Clin Biomech (Bristol). 2019 Dec;70:123-130. doi: 10.1016/j.clinbiomech.2019.08.011. Epub 2019 Aug 23.
Currently, an upright standing posture is normally adopted for evaluations of spinal alignment, which is however sensitive to posture variations. Thus, finding a reproducible reference is essential. This study aimed to evaluate the reproducibility of standing and sitting postures at different arm positions in five consecutive repetitions.
22 asymptomatic subjects (11 males; 11 females) aged 20-35 years were included. Subjects were repeatedly asked to adopt different arm positions in standing and sitting. The absolute reposition errors of lumbar lordosis and sacral orientation between two consecutive repetitions were assessed with a non-radiological back measurement system.
During standing at the relaxed arm position, the median absolute reposition errors of lumbar lordosis and sacral orientation were 1.14° (range 0.23°-3.80°) and 0.92° (range 0.17°-3.27°), respectively, which increased to 1.75° (range 0.21-4.97°) and 1.36° (range 0.35°-4.08°) during sitting (P < 0.01). The absolute reposition error of lumbar lordosis was non-significantly lower at the relaxed and clasped arm positions than at other arm positions. Between the first two repetitions, the absolute reposition errors of both, lumbar lordosis and sacral orientation, were greater than between the remaining two consecutive repetitions (P < 0.01). Both during standing and sitting, lumbar lordosis was smallest when hands holding two bars (P < 0.05).
Sitting showed a worse reproducibility than standing. When assessing sagittal spinal balance, the clasped arm position during standing is recommended and an initial trial can help to reduce inception irreproducibility.
目前，脊柱排列评估通常采用直立姿势，但该姿势对姿势变化敏感。因此，找到一个可重复的参考标准至关重要。本研究旨在评估在五个连续重复动作中，不同手臂位置的站立和坐姿的可重复性。
纳入22名年龄在20 - 35岁之间的无症状受试者（11名男性；11名女性）。受试者被反复要求在站立和坐姿时采用不同的手臂位置。使用非放射学背部测量系统评估连续两次重复动作之间腰椎前凸和骶骨方向的绝对重新定位误差。
在放松手臂位置站立时，腰椎前凸和骶骨方向的中位绝对重新定位误差分别为1.14°（范围0.23° - 3.80°）和0.92°（范围0.17° - 3.27°），而在坐姿时分别增加到1.75°（范围0.21 - 4.97°）和1.36°（范围0.35° - 4.08°）（P < 0.01）。腰椎前凸在放松和紧握手臂位置时的绝对重新定位误差比在其他手臂位置时略低，但无显著差异。在前两次重复动作之间，腰椎前凸和骶骨方向的绝对重新定位误差均大于其余两次连续重复动作之间的误差（P < 0.01）。在站立和坐姿时，双手握住两根杆时腰椎前凸最小（P < 0.05）。
坐姿的可重复性比站立时差。在评估矢状面脊柱平衡时，建议站立时采用紧握手臂的姿势，并且进行一次初始试验有助于减少起始时的不可重复性。
