Turcot Katia, Lachance Bianca
Faculty of Medicine, Department of kinesiology, Laval University, Quebec, Canada; Centre for Interdisciplinary Research in Rehabilitation and Social Integration (CIRRIS), Quebec, Canada.
Faculty of Science and Engineering, Department of Mechanical Engineering, Laval University, Quebec, Canada.
Gait Posture. 2019 May;70:185-189. doi: 10.1016/j.gaitpost.2019.03.005. Epub 2019 Mar 8.
Toe-out foot positioning is increasingly analyzed as a compensatory body-mechanical strategy to reduce pain and joint constraints in people with degenerative joint disease during gait. However, its influence during functional tasks, such as sit-to-stand, has not been reported.
How uni- and bilateral toe-out foot positioning influence body-dynamics during a STS task?
The study was conducted on 15 healthy participants. Seven feet conditions were tested: neutral (N); right toe-out angle of 10° (U10), 20° (U20), and 30° (U30); bilateral toe-out angle of 10° (B10), 20° (B20), and 30° (B30). Execution time, trunk kinematic, vertical ground reaction force ratio as well as maximal knee and hip joint moments were analyzed and compared.
A significant difference was found across conditions in the STS execution time (p = 0.036) showing a main effect on temporal parameters using both uni- and bilateral toe-out foot positioning. A significant difference between conditions was also obtained for the vertical force ratio (p = 0.018) and the maximal knee flexion moment (p = 0.008). Post-hoc tests demonstrated a significant difference on force ratio and on knee flexion moment only while using a more pronounced unilateral toe-out foot positioning.
The influence of toe-out foot positioning on body-dynamics during STS supports the idea of an alteration of body-mechanical strategy, as reported in literature gait studies. The results could have an impact on the management of patients using these strategies in order to reduce the onset of secondary joint diseases such as osteoarthritis.
外八字脚姿势越来越多地被作为一种代偿性身体力学策略进行分析，以减轻退行性关节疾病患者在步态过程中的疼痛和关节受限。然而，其在诸如从坐到站等功能性任务中的影响尚未见报道。
单侧和双侧外八字脚姿势如何影响从坐到站任务中的身体动力学？
对15名健康参与者进行了研究。测试了七种足部姿势：中立位（N）；右侧外八字角度为10°（U10）、20°（U20）和30°（U30）；双侧外八字角度为10°（B10）、20°（B20）和30°（B30）。分析并比较了执行时间、躯干运动学、垂直地面反作用力比值以及最大膝关节和髋关节力矩。
在从坐到站执行时间方面，各姿势条件之间存在显著差异（p = 0.036），表明单侧和双侧外八字脚姿势对时间参数有主要影响。在垂直力比值（p = 0.018）和最大膝关节屈曲力矩（p = 0.008）方面，各条件之间也存在显著差异。事后检验表明，仅在采用更明显的单侧外八字脚姿势时，力比值和膝关节屈曲力矩存在显著差异。
如文献中步态研究报道的那样，外八字脚姿势对从坐到站过程中身体动力学的影响支持了身体力学策略改变的观点。这些结果可能会对采用这些策略的患者管理产生影响，以减少诸如骨关节炎等继发性关节疾病的发生。
