Current theoretical models suggest that ankle sprain copers exhibit movement adaptations contributing to the avoidance of chronic ankle instability. However, few studies have examined adaptations at the level of biomechanical motor synergies. The purpose was to examine characteristics of the support moment synergy between individuals with chronic ankle instability, copers, and healthy individuals. A total of 48 individuals participated in the study. Lower-extremity kinetics and variability in the moment of force patterns were assessed during the stance phase of walking trials. The copers exhibited reductions in the support moment during the load response and preswing phase compared with the chronic ankle instability group, as well as during the terminal stance and preswing phase compared the healthy group. The copers also exhibited reductions in the hip extensor moment and ankle plantarflexion moment compared with healthy and chronic ankle instability groups during intervals of stance phase. Variability of the support moment and knee moment was greater in the copers compared with the chronic ankle instability group. Dampening of the support moment and select joint moments exhibited by the copers may indicate an adaptive mechanism to mitigate loading perturbations on the previously injured ankle. Heightened motor variability in copers may be indicative of a more adaptable motor synergy compared with individuals with chronic ankle instability.

目前的理论模型表明，踝关节扭伤治疗者表现出有助于避免慢性踝关节不稳定的运动适应性。然而，很少有研究考察生物力学运动协同水平的适应性。目的是检查患有慢性踝关节不稳定的个体、应对者和健康个体之间的支撑力矩协同特征。共有 48 人参与了这项研究。在步行试验的站立阶段评估下肢动力学和力矩模式的变异性。与慢性踝关节不稳定组相比，在负荷反应和预摆动阶段，以及与健康组相比，在最终站立和预摆动阶段，应对者表现出支撑力矩的减少。与健康组和慢性踝关节不稳定组相比，在站立相间隔期间，应对者还表现出髋部伸肌力矩和踝关节跖屈力矩的减少。与慢性踝关节不稳定组相比，应对者的支撑力矩和膝关节力矩的变异性更大。支撑力矩和选择关节力矩的阻尼可能表明有一种自适应机制可以减轻先前受伤的脚踝上的负载扰动。与患有慢性踝关节不稳定的个体相比，应对者运动变异性的增强可能表明其适应性更强的运动协同作用。