摘要
目的:探讨基于CT及MRI二维图像数据准确构建出膝关节三维数字有限元模型的可行性,并采用有限元方法分析假体型号不匹配时人工膝关节假体接触表面的应力变化情况。方法:随机选取1名健康成年男性为研究对象,为了对置换后不同型号匹配的膝关节假体进行受力分析将实验对象分为3组。将通过Mimics软件建立膝关节三维数字化模型,按照全膝关节置换标准对膝关节三维数字模型进行虚拟截骨和假体安装,建立全膝关节置换术(TKA)后三维有限元模型。结果:当股骨与胫骨假体的型号不匹配时(F≠T),股骨假体及聚乙烯垫片上受到的最大等效应力都会增加,尤其而当股骨假体小于胫骨假体时(F<T),应力增加更明显。结论 :TKA过程中若股骨假体与胫骨假体型号不匹配,股骨假体及聚乙烯垫片上最大等效应力增加,可能会导致聚乙烯垫片远期磨损增加。
Objective To study the possibility of three dimensional dynamic finite element model based on two-dimensional CT and MRI image data from the knee joint, and to analyze the prosthesis surface contact stress changes when the prosthesis size mismatched by finite element method. Methods The three-dimensional digital model of the knee joint was reconstructed through Mimics software. According to total knee replacement criteria, three-dimensional model bone cutting and prosthesis implant were simulated. Thereby, three-dimensional dynamic finite element model of total knee replacement was constructed. The data was analyzed by SPSS 19.0software, and the significant level α = 0.05. Results The maximum equivalent stress of the femoral prosthesis and polyethylene gasket increased when the femoral prosthesis size and the tibia prosthesis size mismatched（F≠ T）. The stress increased more obviously when the femoral component were less than the tibial prosthesis（F T）. Conclusion The maximum equivalent stress of the femoral prosthesis and polyethylene gasket increased when the femoral prosthesis size and the tibia prosthesis size mismatched, which may increase polyethylene wear.
出处
《实用医学杂志》
CAS
北大核心
2016年第2期222-225,共4页
The Journal of Practical Medicine
基金
云南省创新团队项目(编号:2014HC018)
云南省国际合作项目(编号:2013IA004)
云南省医学学科带头人培养基金(编号:D-201207)
关键词
全膝关节置换
匹配
数字化模型
生物力学
有限元分析
Total knee arthroplasty
Match
3D digital model
Biomechanics
Finite element analysis
