This study aimed to investigate the hip sway and the relationship between the center of pressure (CoP) and kinematic parameters regarding the time series scaling component α in patients with hip osteoarthritis (OA) during a one-leg standing task. The scaling exponent α, SD, hip sway maximal acceleration change, and balance performance, which was measured using CoP parameters, were compared between hip OA and control groups during a one-leg standing task. The relationships between balance performance with CoP parameters and kinematic parameters were investigated with the regression analysis. In the hip OA group, the scaling exponent α was smaller in the medial–lateral direction, and the SD and maximal amount of change in hip sway acceleration were larger in the anterior–posterior direction in the hip OA group. In this group, the CoP parameters were significantly associated with α in the medial–lateral direction (negatively) and in the anterior–posterior direction (positively). In the hip OA group, hip sway adaptability in the medial–lateral direction was limited, while the anterior–posterior direction showed greater movement.

本研究旨在调查髋关节骨关节炎 (OA) 患者在单腿站立任务期间的髋部摆动以及压力中心 (CoP) 与关于时间序列缩放分量 α 的运动学参数之间的关系。在单腿站立任务期间，使用 CoP 参数测量的缩放指数α、SD、髋部摆动最大加速度变化和平衡性能在髋关节 OA 和对照组之间进行了比较。用回归分析研究了平衡性能与 CoP 参数和运动学参数之间的关系。在髋关节 OA 组中，内外侧方向的缩放指数 α 较小，SD髋关节 OA 组前后方向的髋关节摆动加速度的最大变化量更大。在该组中，CoP 参数与内外方向（负）和前后方向（正）的 α 显着相关。在髋关节 OA 组中，髋关节在内侧-外侧方向的摇摆适应性有限，而前后方向则表现出更大的运动。