基于CT的股骨有限元模型的建立及髋关节中空多孔假体植入后受力分布的初步研究(英文)

Finite-element Modeling of Femur Based on CT Data and a Preliminary Study of Stress Distribution of CCB Hip Prosthesis After Implantation

利用有限元分析的方法,对髋关节中空多孔假体植入后的受力分布改变进行研究,为改进中空多孔人工关节假体的设计提供依据.建立了股骨和假体三维有限元模型,应用有限元分析软件Ansys5.7模拟单腿负重状态,考察应力分布并进行比较.使用SPSS Statistics 17.0软件进行分析处理,绘制折线图.结果表明:a.开孔后张力侧最大压应力有所减小,开孔部位的应力水平变化不明显.b.与周围骨质形成连接后孔缘局部应力增加,张力侧受力改变不明显.c.短柄假体受力模式仍为远端应力集中;张力侧应力减小,开孔部位应力明显增加.d.下孔受力均大于上孔,受力方向基本一致.

Finite element method（FEM） models have been developed.Here a loading is applied and the stress distribution is detected,and then a comparative study is carried out under different conditions.Data are provided to optimize the design of CCB hip prosthesis.FEM models of femur and CCB hip prosthesis are established;the condition of monopod support is imitated and the stress distributions are detected and compared under different conditions using three-dimension finite element analysis software Ansys5.7.The data are treated with SPSS Statistics 17.0 and presented in line chart.Result showed that（1） Connection by cancellous bone will increase stresses around the hole;（2） Holes on the lateral side can lower the maximum stress on the lateral side slightly;（3） Shortening the length of the prosthesis can enlarge the biomechanical effect of the design;（4） Stress around the lower hole is always higher than the upper one,and the direction of the force in the corresponding position basically remains the same.