股骨柄假体与骨固定界面三维有限元模型的构建及其生物力学意义  

Construction of Three Dimensional Finite Element Model of the Fixed Interface between the Cementless Prosthesis and Femur and Its Biomechanical Significance

作　　者：蔡春元[1] 李永奖[1] 张美超[2] 林瑞新[1] 张力成[1] 杨国敬[1] 钟世镇[2] 

机构地区：[1]温州医学院附属第三医院骨科,325200 [2]南方医科大学生物力学研究室

出　　处：《医学研究杂志》2013年第3期65-69,共5页Journal of Medical Research

基　　金：浙江省科技计划基金资助项目(2009C33144);温州市科技计划基金资助项目(Y20090274);瑞安市科技计划基金资助项目(201102033)

摘　　要：目的探讨非骨水泥型人工髋关节假体柄-骨固定界面三维有限元模型的构建方法及其生物力学意义。方法选用股骨标本和股骨柄假体,分别行薄层CT扫描,保存断层扫描图像。将CT扫描数据以Dicom格式导入Mimics软件,进行灰度阈值调整、区域分割后,重建两者的三维模型,并模拟髋关节置换术进行装配。股骨体内腔与股骨柄之间定义为面-面接触关系,在Freeform软件中对各模型铺面处理后以IGES格式导入有限元分析软件Ansys中,采用十结点solid 185单元进行网格划分,选择人体45%步态相模拟人体攀爬楼梯工况,分析相应的von Mises应力分布情况以及界面接触压力、磨擦应力和相对滑动位移。结果所构建的面-面接触连接、界面划移的非骨水泥型髋假体-骨界面三维有限元模型,客观反映假体-骨界面的真实解剖形态及生物力学行为,还原性良好,可以满足有限元分析的需要。结论 构建的非骨水泥型人工髋关节假体-骨固定界面三维有限元模型,为非骨水泥型髋关节置换术后假体-骨固定界面骨改建、骨整合的力学基础研究提供精确模型。Objective To construct three - dimensional finite element model of the fixed interface between the cementless prosthesis and femur and investigate its biomechanical significance by finite element analysis. Methods A wet femoral sample from corpse and fem- oral stem prosthesis were scaned by CT and all images of every cross - section layer was obtained,and a femoral model and stem prosthesis model were contructed with Mimics software. There was a assemble when hip arthroplasty being simulated. The von Mises stress distribu- tion and the contact pressure, friction stress and relative sliding displacement between the interface were analyzed when the stairs manuver simulated. The bone and metal components were meshed as rigid bodies, composed of three - dimensional rigid body elements, and the fixed interface between the eementless prosthesis and femur was fully three - dimensional, face - face contact elements representations. Results The current form of this fixed interface between the cementless prosthesis and femural finite element model provided for face - face contact, displacement interfacial sliding interface representation, and clearly reflected the real fixed interface anatomy and biomechan- ical behavior, which was able to cope with finite element analysis. Conclusion The consruction of the fixed interface between the ce- mentless prosthesis and femural finite element model provides the precise model for research on mechanical behavior of the bone remode- ling and bone integration between the interface after hip replacement.

关 键 词：关节成形术 置换 髋 髋假体 三维有限元模型 有限元分析 

分 类 号：R783.6[医药卫生—口腔医学]