基于足部生物力学原理的足底分布力测量方法及系统研制

Development of a method and system for measuring plantar distribution force based on the principle of foot biomechanics

依据足部生物力学原理,提出一种足底三分区测量分布力方法,并研制了相应的分布力测力台(DFP)系统。随机选取27名青年人和40名老年人进行双足睁眼站立-双足闭眼站立-单足睁眼站立连续过程的姿势稳定性测评,求解右足3个分区的压力中心(CoP)轨迹范围(95%置信圆面积)和3个站立阶段的CoP轨迹的位置偏移量作为分析足底支撑特点的参数。青老年人组的足底3个分区中CoP轨迹的最大范围值分别为27.00~227.46 mm2与116.35~387.22 mm2;前后侧的最大。偏移量分别为6.07±3.13 mm与5.88±3.21 mm;内外侧的最大。偏移量分别为6.51±2.29 mm与6.77±2.34 mm。结果表明,3个分区的CoP轨迹在双足站立和单足站立姿态下均集中在跟骨底端和跖趾关节横弓的内外侧两个端点上,位置受姿势稳定性差异条件的影响小。

According to the principle of foot biomechanics,a three-division method of measuring distributed force of the sole was proposed,and the corresponding distributed force measuring platform(DFP)system was developed.Twenty-seven young adults and forty elder adults were randomly selected for stability measurements in the continuous process from double-leg stance with eyes closed to double-leg stance with eyes opened and to single-leg stance with eyes opened.The foot support principle was analyzed by solving the CoP trajectories(95%confidence circle area)of three zones of the right foot and the CoP trajectories offset in three standing stages.The maximum values of the CoP trajectory range in the three partitions of the youth and elderly groups were respectively 27.00~227.46 mm^(2)and 116.35~387.22 mm^(2),the maximum offsets of the anterior-posterior direction were 6.07±3.13 mm and 5.88±3.21 mm respectively,and the maximum offsets of the medial-lateral direction were 6.51±2.29 mm and 6.77±2.34 mm respectively.The results show that the CoP trajectories are concentrated on the bottom end of the calcaneus and the medial and lateral end points of the transverse arch of the metatarsophalangeal joint in both doubleleg stance and single-leg stance,and the position is less affected by the difference in postural stability.