摘要
目的建立人工髋关节置换术后的三维有限元模型,分析假体和股骨的力学分布,为研究活体内假体及评估手术实施情况提供新的方法。方法选择1例生物型人工髋关节假体置换后志愿者,64排CT扫描髋关节,通过三维建模软件建立三维有限元模型,模拟单肢负重站立状态下的受力,分析假体和股骨的应力分布;实际植入位置为实验组,对假体植入的角度进行-10°、-5°、+5°、+10°的模拟作为对照组,研究相应位置的应力变化情况,并与实际手术情况进行对比。结果患者人工股骨头假体置换术后CT扫描图像建立的三维有限元模型,经受力比较发现并非为最佳植入位置。结论活体人工髋关节模型的应力分布是假体置换后的应力传导真实反映。人工髋关节活体建模可以对手术结果进行更为合理、可靠的分析。
Objective To establish a three-dimension finite element model with CT scanned pictures of hip arthroplasty for analyzing the stress distribution on the femur and on the prosthesis,providing a new method to evaluate the femoral prosthesis in vivo.Methods One volunteer with uncemented prosthesis was scanned with 64 slice CT to obtain configurations.With the software,a three-dimension model of femur with prosthesis was established.Simulating one leg standing state,the stress distribution was analyzed on the femur and on the prosthesis as experimental group.Compared to the experimental group,modifying input position with-10°,-5°,＋5°,＋10°,and stimulating the stress distribution with same load,then compared with the stress distribution with the experimental group.Results The finite element model has been established,using the pictures that the prosthesis in the body with CT scan.The experimental group which demonstrated the true position of the prosthesis in the vivo was not the best input position.Conclusions The stress distribution on the model established base on the people with prosthesis can reflect the truly stress after hip replacement.The finite element model established based on the femur prosthesis in vivo can be used to evaluate the position of the prosthesis and can provide help for the clinical.
出处
《临床骨科杂志》
2012年第2期205-209,共5页
Journal of Clinical Orthopaedics
基金
上海交通大学-上海市徐汇区中心医院有限元临床研究中心基金资助(编号:FEM2010001)
关键词
活体
髋关节假体
CT
成像
三维
有限元分析
模型
生物学
应力
植入位置
in vivo
total hip arthroplasty
CT
imaging
three-dimensional
finite element analysis
models
biological
position
