单间室膝关节假体衬垫在步态载荷下的磨损性能仿真分析

Simulation analysis of wear performance for tibial insert of unicompartmental knee arthroplasty prosthesis under gait load

背景:目前,有限元分析多用于全膝关节假体衬垫的磨损仿真研究。目的:利用有限元分析单间室膝关节假体衬垫形状优化对磨损性能的影响。方法:基于Archard磨损理论建立了单间室膝关节假体的磨损有限元模型,研究了衬垫优化前后的接触压力及磨损性能变化规律。结果与结论:(1)在ISO标准步态载荷工况条件下,优化前后的衬垫接触压力分别为54.7 MPa和37.2 MPa,优化后的衬垫接触压力降低了32%;优化前后的衬垫线性磨损分别为4.38×10^-5mm和3.15×10^-5mm,优化后的衬垫线性磨损深度降低了28%;(2)结果表明优化后的衬垫可明显提高线性磨损性能,研究结果对单间室膝关节衬垫设计、磨损性能评估以及临床应用具有实际意义。

BACKGROUND:At present,finite element analysis is mostly used in the simulation study of wear of the total knee prosthesis pad.OBJECTIVE:To study the effect of shape optimization for the tibial insert of the unicompartmental knee prosthesis on wear performance using finite element analysis.METHODS:Based on the Archard wear theory,the wear finite element model of the unicompartmental knee prosthesis was established.The contact pressure and wear performance of the tibial insert before and after optimization were studied.RESULTS AND CONCLUSION:(1)Under the condition of ISO standard gait load,for the contact pressure,the tibial insert contact pressure before and after optimization was 54.7 MPa and 37.2 MPa,respectively,and the tibial insert contact pressure was reduced by 32%.For linear wear,the linear wear of the tibial insert before and after optimization was 4.38×10^-5 mm and 3.15×10^-5 mm,respectively,and the linear wear depth of the tibial insert was reduced by 28%.(2)The results show that the liner wear performance can be significantly improved after optimization.The results of the study have practical significance for unicompartmental knee tibial insert design,wear performance assessment and clinical application.