Objective: In the literature, it is not clear whether rheumatoid arthritis (RA) post-menopausal women have different ankle biomechanical parameters than healthy post-menopausal women. This study aimed to compare the ankle kinematics and kinetics during the gait stance phase of RA post-menopausal women with age-matched healthy post-menopausal women. Materials and methods: A three-dimensional motion analysis system (9 cameras; 200 Hz) synchronised with a force plate (1000 Hz) was used to assess ankle kinematics and kinetics during barefoot walking at a natural and self-selected speed. A biomechanical model was used to model body segments and joint centres (combined anthropometric measurements and the placement of 39 reflective markers). Thirty-six women (18 RA post-menopausal women and 18 age-matched healthy post-menopausal women) performed 14 valid trials (comprising seven left and seven right footsteps on a force plate). Lower limb muscle mass was evaluated by an octopolar bioimpedance analyser. Results: RA post-menopausal women yielded a longer stance phase and controlled dorsiflexion sub-phase (p < 0.001), higher dorsiflexion at the final controlled dorsiflexion sub-phase and lower plantar flexion at toe off (p < 0.05), lower angular displacements (p < 0.05), and lower ankle moment of force peak and ankle power peak (p < 0.001). No intergroup differences were found in lower limb muscle mass. Conclusions: RA post-menopausal women yielded changes in ankle kinematic and kinetic parameters during the gait stance phase, resulting in a lower capacity to produce ankle moment of force and ankle power during the propulsive gait phase.

中文翻译：

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健康和类风湿关节炎绝经后妇女步态期间的脚踝运动学和动力学。

目的：在文献中，尚不清楚风湿性关节炎（RA）绝经后妇女的踝关节生物力学参数是否与健康的绝经后妇女不同。这项研究旨在比较RA绝经后女性与年龄匹配的健康绝经后女性在步态阶段的脚踝运动学和动力学。材料和方法：使用三维运动分析系统（9个摄像头； 200 Hz）与一个测力板（1000 Hz）同步，以自然和自行选择的速度评估赤脚行走过程中的脚踝运动学和动力学。使用生物力学模型对人体节段和关节中心进行建模（结合人体测量和39个反射标记的放置）。三十六名妇女（18名绝经后妇女和18名年龄相匹配的健康绝经后妇女）进行了14项有效试验（在推力板上包括7个左右脚步）。通过八极生物阻抗分析仪评估下肢肌肉质量。结果：绝经后RA患者的站立姿势阶段和背屈控制子期更长（p <0.001），最终受控背屈子阶段的背屈更高，脚趾离地时足底屈曲性更低（p <0.05），角位移更低（p <0.05）和较低的踝关节力矩峰值和踝关节力量峰值（p <0.001）。下肢肌肉质量未发现组间差异。结论：RA绝经后妇女在步态站立阶段的脚踝运动学和动力学参数发生变化，