活动式与固定式UKA衬垫的接触力学和磨损对比研究  

Comparative Study on Contact Mechanics and Wear of Mobile-and Fixed-Bearing UKA Inserts

作　　者：屈亚飞 张静 陈瑱贤 高永昌 张烜 靳忠民 QU Yafei;ZHANG Jing;CHEN Zhenxian;GAO Yongchang;ZHANG Xuan;JIN Zhongmin(School of Construction Machinery,Chang’an University,Xi’an 710064,China;School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]长安大学工程机械学院,西安710064 [2]西南交通大学机械工程学院,成都610031

出　　处：《医用生物力学》2023年第5期961-968,共8页Journal of Medical Biomechanics

基　　金：国家自然科学基金项目(11902048,12102065,52035012);陕西省自然科学基金项目(2022JQ-529);长安大学中央高校基本科研业务费专项资金(300102252106)。

摘　　要：目的采用计算机模拟方法对比研究ISO 14243-1∶2009力控制标准测试条件下单髁膝关节置换术(unicompartmental knee arthroplasty,UKA)活动式与固定式衬垫的接触力学和磨损性能。方法采用有限元方法分析两种衬垫在测试条件下的接触应力和von Mises应力,并采用磨损预测模型模拟5 MC(million cycles,百万次循环)步态周期工况获得两种衬垫的线性磨损深度、磨损体积。结果磨损前活动式与固定式衬垫的最大接触应力分别为15.7、44.3 MPa,最大von Mises应力分别为11.94、23.33 MPa。随着磨损加剧,活动式衬垫的最大接触应力和von Mises应力先减小后趋于稳定,而固定式衬垫的基本保持不变。固定式衬垫的线性磨损深度为活动式的1.5倍,但活动式衬垫的磨损体积是固定式的5.4倍,且活动式衬垫的背部磨损体积占其总磨损体积的70%。结论与固定式UKA衬垫相比,活动式UKA衬垫具有较低的接触应力与von Mises应力,但有较大的磨损体积。活动式衬垫背部磨损是磨屑增加的另一个重要来源。Objective To compare and study contact mechanics and wear performance of mobile-and fixedbearing unicompartmental knee arthroplasty(UKA)under ISO 14243-1∶2009 force control standard test condition by computational simulation.Methods The contact stress and von Mises stress of mobile-and fixed-bearing UKAs under the test condition were analyzed by finite element method.The linear wear depth and wear volume of both UKA inserts were obtained after simulating gait with 5 million cycles(MCs)using wear prediction model.Results The maximum contact stresses of mobile-and fixed-bearing UKAs before wear were 15.7 MPa and 44.3 MPa respectively,and the maximum von Mises stresses were 11.94 MPa and 23.33 MPa respectively.With the increase of wear,the maximum contact stress and von Mises stress of the mobile-bearing UKA decreased first and then became stable,while that of the fixed-bearing UKA remained basically unchanged.The linear wear depth of fixed-bearing UKA was 1.5 times that of mobile-bearing UKA.But the wear volume of mobile-961 bearing UKA was 5.4 times that of fixed-bearing UKA,and the wear volume on backside surface accounted for 70%of the total wear volume of mobile-bearing UKA.Conclusions Compared with the fixed-bearing UKA,the mobile-bearing UKA had lower contact stress and von Mises stress,but larger wear volume.The backside wear of mobile-bearing UKA was an important source of increased wear debris.

关 键 词：单髁膝关节置换术 固定式衬垫 活动式衬垫 接触力学 磨损预测 

分 类 号：R318.01[医药卫生—生物医学工程]