足底软组织硬化对足部生物力学性能影响的三维有限元分析  

Effects of stiffness of plantar soft tissue on foot biomechanical behavior:a 3D finite element analysis

作　　者：李云婷[1] 陶凯[1] 王冬梅[1] 王旭[2] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240 [2]复旦大学附属华山医院骨科,上海200040

出　　处：《医用生物力学》2009年第3期169-173,共5页Journal of Medical Biomechanics

基　　金：国家自然科学基金重点项目(30530230)

摘　　要：目的通过有限元方法研究足底软组织整体硬化以及跖骨头和跟骨下方软组织局部硬化对人体足踝系统力学性能的影响。方法基于健康志愿者右足的核磁共振扫描图片建立足部三维有限元模型,通过改变足底软组织的生物力学属性和人体平衡站立位时的计算仿真来分析足底软组织的生物力学问题。同时,对志愿者进行足底压力测试来验证模型的有效性。结果建立足踝有限元模型得到了有效的验证并完成了不同软组织属性定义下站立位的运算;在平衡站立位时足底接触压力分布状况和足踝内部一些软、硬组织的受力情况得到量化。结论软组织硬化,特别是跖骨头和跟骨下方软组织局部硬化,对足底受压接触面积、压力峰值以及足底软组织垫所受的应力等产生了很大影响,增加了糖尿病患者发生足底溃烂的可能性。Objective To investigate the biomechanical effects of the whole hardening of plantar soft tissue and the local hardening under metatarsal heads and calcaneus on human foot and ankle system. Method Building a 3D finite element model based on the MRI scanning pictures of a healthy young volunteer and changing the material property of plantar soft tissue to simulate different plantar soft tissue status; and three solutions simulating the balanced standing were done to compare model＇ s predictions. In addition, the plantar pressure measurement of the volunteer was used to validate the model. Result The foot model was created and validated. Three solutions were completed under different material properties of plantar soft tissue, and the contact pressure distribution and some mechanical information of internal soft and hard tissue were quantified. Conclusions The hardening of plantar soft tissue, especially the local hardening, greatly affects the contact pressure distribution and stress magnitudes in plantar soft tissue, which would increase potential risk of plantar ulcer.

关 键 词：足踝 糖尿病 足底软组织 有限元分析 力学性能 

分 类 号：R318.01[医药卫生—生物医学工程]