Wong P Y, Chen M D, Hong W H, Chen H C, Wong M K, Tang F T
Department of Rehabilitation Medicine, Chang Gung Memorial Hospital, Taipei, Taiwan, R.O.C.
Changgeng Yi Xue Za Zhi. 1998 Mar;21(1):20-7.
Many problems of the foot are due to abnormal plantar pressure and shear force, but until now shear force could not be accurately measured. Different methods can be used to reduce foot pressure, such as foot orthosis or shoe modification. The purposes of our study were to propose a method for measuring the maximum shear force of the foot and also to investigate the effect of silicone-insole socks in reducing the peak plantar pressure and shear stress of the foot.
Twenty-two healthy subjects were included in this study, each subject underwent 2 kinds of experiments to study the peak plantar pressure, the horizontal shear reaction force, and the maximum shear force under 3 conditions: barefoot, wearing 100% cotton socks, and wearing silicone-insole socks.
Our results showed a significant decrease in midfoot peak plantar pressure while walking, and a decrease in horizontal shear reaction force and maximum shear force while wearing cotton socks and silicone-insole socks in walking and pulling. Silicone-insole socks were more significant in decreasing horizontal shear reaction force than cotton socks.
Silicone-insole socks are better than cotton socks in reducing horizontal shear reaction forces and their friction coefficients. Because only normal subjects have been tested, further study is required to prove the efficacy of silicone-insole socks on different kinds of foot pathology.
足部的许多问题都归因于足底压力和剪切力异常，但迄今为止，剪切力尚无法准确测量。可采用不同方法来减轻足部压力，如使用足部矫形器或修改鞋子。我们研究的目的是提出一种测量足部最大剪切力的方法，并研究含硅胶鞋垫的袜子在降低足部峰值足底压力和剪切应力方面的效果。
本研究纳入了22名健康受试者，每位受试者都进行了两种实验，以研究在三种条件下的峰值足底压力、水平剪切反作用力和最大剪切力，这三种条件分别是：赤足、穿着100%纯棉袜子以及穿着含硅胶鞋垫的袜子。
我们的结果显示，行走时中足峰值足底压力显著降低，穿着纯棉袜子和含硅胶鞋垫的袜子行走及拉伸时，水平剪切反作用力和最大剪切力均降低。含硅胶鞋垫的袜子在降低水平剪切反作用力方面比纯棉袜子更显著。
含硅胶鞋垫的袜子在降低水平剪切反作用力及其摩擦系数方面优于纯棉袜子。由于仅对正常受试者进行了测试，因此需要进一步研究以证明含硅胶鞋垫的袜子对不同类型足部病变的疗效。
