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首页> 外文期刊>Journal of orthopaedic research >Retrieval, experimental, and computational assessment of the performance of total knee replacements.
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Retrieval, experimental, and computational assessment of the performance of total knee replacements.

机译：对全膝关节置换术的性能进行检索，实验和计算评估。

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Wear mechanisms in polyethylene components for total knee replacements are inherently mechanical; the local stresses or strains exceed some material limit. Retrieval analysis and knee simulators have provided the means to quantify the damage observed in vivo or in vitro. These results have been circumstantially linked to the material stresses obtained from computational simulations using finite element analysis, knee simulator tests, and computational simulations of two condylar knee designs. We hypothesize that if an equivalent loading environment is produced in the computational simulation, we can correlate the distribution of computed stresses with observed damage of simulator specimens and further relate design differences to in vivo performance from retrieval analyses. The finite element model agreed with the knee simulator kinematics and kinetics within 2-13%, and composite FEA contact areas matched 66-90% of the damage areas due to burnishing on the simulator specimens. Burnishing was the primary mode of damage for both the simulator and retrieval specimens corresponding with the relatively low magnitudes of contact stress observed. Both the computational and experimental techniques underpredicted the amount determined from retrieval analysis, but the differences between the two designs were consistent for all three methods. Combining these techniques strengthens the applicability of the computational simulation while highlighting the complementary approach of these methods for preclinical testing and assessing the link between material state and damage.
机译：聚乙烯组件中用于全膝关节置换的磨损机制本质上是机械的。局部应力或应变超过某些材料极限。检索分析和膝盖模拟器提供了量化体内或体外观察到的损伤的方法。这些结果与使用有限元分析，膝部模拟器测试以及两种con突膝部设计的计算机模拟从计算模拟中获得的材料应力有关联。我们假设，如果在计算模拟中产生了等效的加载环境，则可以将计算应力的分布与模拟器标本的观察到的损坏相关联，并将设计差异与取回分析的体内性能进一步相关。有限元模型与膝部模拟器的运动学和动力学相吻合，误差在2-13％之内，并且由于在模拟器样品上打磨，复合FEA接触面积与损坏区域的66-90％相匹配。抛光是模拟器和取回试样的主要损坏方式，与观察到的相对较低的接触应力大小相对应。计算和实验技术都低估了从检索分析确定的数量，但是两种设计之间的差异对于这三种方法都是一致的。结合这些技术可增强计算模拟的适用性，同时强调这些方法用于临床前测试和评估材料状态与损坏之间的联系的互补方法。

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