Liu H, Ellison P J, Xu H, Jin Z
Theory of Lubrication and Bearing Institute, Xi'an Jiaotong University, Xi'an, People's Republic of China.
Proc Inst Mech Eng H. 2010;224(8):989-1003. doi: 10.1243/09544119JEIM687.
To date, fully coupled dynamics and contact mechanics analysis is still limited by expensive computational cost and long computing time and has not been addressed comprehensively, particularly in the hip joint. To understand the influence of different parameters on the biomechanics of the total hip replacement (THR) and improve its design, two numerical approaches were developed and implemented in finite element models to investigate the coupling between the dynamics response and the contact mechanics for three different THR configurations, metal-on-polyethylene (MOP), metal-on-metal (MOM), and ceramic-on-ceramic (COC). The dynamic force and the contact pressure distribution at the bearing surfaces from the two methods were predicted and compared. The influences of various parameters (motion angle, load applied in the pendulum, friction coefficient, geometry, and material properties) were subsequently investigated. From the comparisons, the decoupled method, based on the rigid-body dynamics and the quasi-static elastic contact mechanics, was adequate to predict the performance of the THRs efficiently. The load had the greatest influence on the dynamics/contact mechanics among other factors.
迄今为止，完全耦合动力学与接触力学分析仍受计算成本高昂和计算时间长的限制，尚未得到全面解决，尤其是在髋关节方面。为了解不同参数对全髋关节置换术（THR）生物力学的影响并改进其设计，在有限元模型中开发并实施了两种数值方法，以研究三种不同THR构型（金属对聚乙烯（MOP）、金属对金属（MOM）和陶瓷对陶瓷（COC））的动力学响应与接触力学之间的耦合。预测并比较了两种方法在轴承表面的动态力和接触压力分布。随后研究了各种参数（运动角度、摆锤施加的载荷、摩擦系数、几何形状和材料特性）的影响。通过比较，基于刚体动力学和准静态弹性接触力学的解耦方法足以有效地预测THR的性能。在其他因素中，载荷对动力学/接触力学的影响最大。
