6—7岁儿童扁平足的生物力学特点

Biomechanical behavior of 6-7 years children flatfoot

目的:探讨6—7岁儿童扁平足的发生概率,并进一步调查扁平足的生物力学特征。方法:利用MIMICS软件测量210足在负重位时足弓高度和足跟外翻度数,并通过Footscan数据测量比较正常足和扁平足的足底压力区域和接触面积的不同,进行统计学分析。结果:此年龄段内扁平足的生物力学特征即为足弓高度低于22.93mm,足弓塌陷发生率为31.43%;足跟外翻角度大于7.66°,发生概率为87.62%。两者同时发生的概率约为27.61%。与正常足足底压力和接触面积相比,扁平足足底压力主要集中在前足的第二跖区、第三跖区和足跟内侧区域,中足接触面积增加41.9%。结论:6—7岁儿童中扁平足约占三分之一,本研究为儿童足部健康调查及鞋类设计提供了一些参数。

Objective:Exploring the occurrence and biomechanical behavior of 6—7 years children flatfoot.Method:The arch height and heel valgus degree of 210 feet during weight bearing were taken with SHANGHE and MIMICS.And then,the plantar pressure and contact area were measured with Footscan.Result:The biomechanical characters of flatfoot in this age group was that the incidence of arch collapse lower than 22.93mm is 31.43%;Probability of heel valgus angle greater than 7.66°is 87.62%.The incidence of both was about 27.61%.Compared with the normal foot,the plantar pressure of flatfoot mainly concentrated on regions of the second metatarsal,the third metatarsal and the medial heel;the contact area of the midfoot increased by 41.9%.Conclusion:About a third of 6—7y children is flatfoot.This will provide the refference data for the children's foot health and shoe design.