足部跖趾关节约束对人体步态稳定性的影响

目的 研究足部跖趾关节约束对人体步态稳定性的影响。 方法 在水平湿滑试验台上进行足部跖趾关节有、无约束两种状态下的步态实验,分析时空步态参数、运动学参数、动力学参数以及利用摩擦因数( utilization coefficient of friction,UCOF)差异。 结果 跖趾关节有约束状态下,人体行走平均步速减小 50 mm/ s,跨步长度缩小0. 22 m,双支撑相时间缩短 70 ms;跖趾关节约束会使髋、膝关节在矢状面内的活动范围显著增大,而踝关节活动范围减小。 同时,跖趾关节约束状态 UCOF 幅值是无约束状态的 1. 15 倍,表明人体滑跌的概率增大以及行走不稳定性增加。 结论 足部跖趾关节约束会降低行走稳定性。 研究结果为足部趾屈运动康复设备的研发提供数据和理论支持

Effects of Metatarsophalangeal Joint Constraints on Human Gait Stability

Objective To investigate the effect of foot metatarsophalangeal (MTP) joint constraint on human gait stability. Methods Gait experiment under two states was conducted on a horizontal wet-slip test bench, namely,with and without constraint of the MTP joints. The differences in time-space gait parameters, kinematic parameters, kinetic parameters, and utilization coefficient of friction (UCOF) were analyzed. Results Under the state of MTP joint constraint, the average human walking speed was reduced by 50 mm / s, the stride length was reduced by 0. 22 m, and the double support phase time was shortened by 70 ms. MTP joint constraint resulted in a significant increase in the range of motion (ROM) of the hip and knee in sagittal plane and a decrease in the ROM of the ankle. Meanwhile, the UCOF amplitude with MTP joint constraint was 1. 15 times higher than that without MTP joint constraint, indicating an increased probability of human slip and fall as well as an increased walking instability. Conclusions MTP joint constraint in the foot can reduce walking stability. The results of thisstudy provide data and theoretical support for the development of toe flexion rehabilitation device.