高吻合度股胫关节面人工膝关节假体的磨损

目的 探讨人工膝关节假体股胫关节面高吻合度对假体运动和衬垫磨损的影响。方法设计和制作一款冠状面高吻合度膝关节假体，并用体外磨损实验和有限元模拟相结合的方法研究该假体衬垫的磨损。结果 体外试验和有限元模拟所得的衬垫质量磨损率分别为(14.29±3.19) mg/MC和14.67 mg/MC（million cycle, MC,百万次循环）。5 MC后，体外试验和有限元模拟得到的衬垫磨损区域大致吻合，在中部区域会出现较为严重的磨损。结论 有限元模拟与体外试验结果较为一致，股胫关节面冠状面高吻合度假体的磨损率较低。研究结果对高吻合度人工膝关节假体的磨损评估及临床应用具有实际意义。
Objective To investigate the effect of the tibiofemoral joint surface with high conformity on total knee prosthesis motion and insert wear. Methods A type of knee prosthesis with a high coronal conformity was designed and manufactured, and its insert wear was studied by in vitro wear testing combined with finite element simulation. ResultsThe mass wear rates calculated by the in vitro wear testing and finite element simulation were (14.29±3.19) mg/MC and 14.67 mg/MC (MC, million cycle), respectively. After five MCs, the areas of the insert wear obtained by both the methods were basically consistent, and severe wear was found to occur in the middle part of the insert. ConclusionsThe result of the finite element simulation coincided with that of the in vitro testing. The wear rate of the tibiofemoral joint surface of the total knee prosthesis with a high coronal conformity was relatively low. The research outcomes have practical significance for the evaluation and clinical application of the total knee prosthesis with a high conformity.