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首页> 外文期刊>Journal of Biomechanics >Kinematic adaptations to a variable stiffness shoe: Mechanisms for reducing joint loading
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Kinematic adaptations to a variable stiffness shoe: Mechanisms for reducing joint loading

机译：运动适应变刚度鞋：减少关节负荷的机制

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A recently described variable-stiffness shoe has been shown to reduce the adduction moment and pain in patients with medial-compartment knee osteoarthritis. The mechanism associated with how this device modifies overall gait patterns to reduce the adduction moment is not well understood. Yet this information is important for applying load modifying intervention for the treatment of knee osteoarthritis.A principal component analysis (PCA) was used to test the hypothesis that there are differences in the frontal plane kinematics that are correlated with differences in the ground reaction forces (GRFs) and center of pressure (COP) for a variable-stiffness compared to a constant-stiffness control shoe. Eleven healthy adults were tested in a constant-stiffness control shoe and a variable-stiffness shoe while walking at self-selected speeds. The PCA was performed on trial vectors consisting of all kinematic, GRF and COP data.The projection of trial vectors onto the linear combination of four PCs showed there were significant differences between shoes. The interpretation of the PCs indicated an increase in the ankle eversion, knee abduction and adduction, decreases in the hip adduction and pelvic obliquity angles and reduced excursion of both the COP and peak medial-lateral GRFs for the variable-stiffness compared to the control shoe.The variable-stiffness shoe produced a unique dynamic change in the frontal plane motion of the ankle, hip and pelvis that contributed to changes in the GRF and COP and thus reduced the adduction moment at a critical instant during gait suggesting a different mechanism that was seen with fixed interventions (e.g. wedges).
机译：已经显示出一种最近描述的可变刚度的鞋可以减少中隔膝关节骨关节炎患者的内收力矩和疼痛。与该设备如何修改总体步态模式以减少内收力矩有关的机制尚未得到很好的理解。然而，这些信息对于应用负荷调节干预措施治疗膝骨关节炎很重要。主要成分分析（PCA）用于检验以下假设：额叶面运动学差异与地面反作用力差异相关（ GRFs和压力中心（COP），与恒定刚度的控制蹄相比，可变刚度。在以自选速度行走的同时，对11名健康成年人进行了恒定硬度的控制鞋和可变硬度的鞋的测试。对所有运动学，GRF和COP数据组成的试验向量执行PCA。将试验向量投影到四台PC的线性组合上显示，鞋子之间存在显着差异。与对照鞋相比，PC的解释表明踝外翻，膝关节外展和内收增加，髋关节内收和骨盆倾斜角减小，COP和内侧-外侧GRF峰值偏移对于可变刚度而言都降低了。变刚度鞋在踝，髋和骨盆的额叶平面运动中产生了独特的动态变化，从而导致GRF和COP的变化，从而减少了步态中关键时刻的内收力矩，这表明这是一种不同的机制。固定干预（例如楔形）时可见。

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