小腿截肢患者残端应力的三维有限元动态分析  

3D finite element dynamic analysis of interface stress at residual limb of a trans-tibial amputee

作　　者：贾晓红[1] 张明[2] 王人成[1] 金德闻[1] 

机构地区：[1]清华大学精仪系,北京100084 [2]香港理工大学复康科技中心

出　　处：《中国康复医学杂志》2004年第5期334-336,共3页Chinese Journal of Rehabilitation Medicine

基　　金：国家自然科学基金(50305013);香港RGC(PolyU5200/02E)资助项目

摘　　要：目的:研究接受腔/残肢界面应力分布特征,为假肢优化设计提供基础。方法:基于核磁共振图像,获得小腿截肢患者残端和假肢几何特征,建立三维非线性有限元模型,通过比较站立状态和行走过程中的界面应力,研究动态载荷对界面压力的影响。结果:界面压力主要分布在髌韧带、胫骨内外侧和窝区,一个平地正常速度行走的步态周期内,残肢界面的最大平均正压力是单腿站立状态下的1.15倍,最大平均切应力是单腿站立状态的1.4倍。结论:动态载荷使残肢和接受腔之间的界面应力增大,行走过程的动态影响不宜忽略。Objective:A quantitative understanding of the interface stress distribution between prosthetic socket and residual limb is fundamental for an optimal design of artificical limb. Method: The geometry of residual limb and prosthesis was obtained based on MR images, a 3D nonlinear finite element(FE)model was developed.The interface stresses were compared between walking and standing state, and the effect of dynamic loads of interface stress was investigated.Result:Interface stress was mainly distributed at patella tendon,lateral tibia,media tibia and popliteal pit regions,and the average peak interface pressure during walking was 1.15 times as the one with single-leg standing,and the shear stress was 1.4 times. Conclusion:Interface stress between the residual limb and prosthetic socket increases due to the dynamic loads.The dynamic effects during walking can′t be ignored.Author′s address Dept. of Precision Instruments, Tsinghua University, Beijing, 100084

关 键 词：小腿截肢 假肢接受腔 界面应力 有限元分析 动态载荷 

分 类 号：R687.5[医药卫生—骨科学]