老年人股骨颈骨折股骨头置换术中短柄假体的有限元分析

摘要

目的：针对老年人股骨颈骨折后假体置换术，使用有限元分析的方法对股骨短柄假体与常规股骨假体的生物力学特性进行对比。方法利用薄层CT资料建立股骨三维有限元模型，利用我院股骨中空多孔股骨假体相关参数建立两种髋关节股骨假体三维有限元模型；应用Ansys 5.7有限元分析软件考察两种假体植入后的应力分布，并进行比较。结果短柄假体所受最大mises应力较常规股骨假体明显减小；力学传导模式仍为远端应力集中，最大mises应力仍出现在张力侧。结论老年人股骨颈骨折关节置换术中短柄假体力学特性优越。%Objective To compare biomechanical properties of the short-stem prosthesis with conventional prosthesis with the finite element analysis method for the elderly femoral neck fracture after femoral head replace -ment.Methods Three-dimensional finite element models of the upper femur and prosthesis were established .The stress distribution difference between the short-stem prosthesis and conventional prosthesis was compared by using fi-nite element analysis software Ansys 5.7.Results The maximum mises stress of the short-stem prosthesis de-creased significantly,while stress distribution model remained the same .Conclusion The short-stem prosthesis presents superior mechanical properties in femoral head replacement among the elderly femoral neck fractures .