Retrieval, experimental, and computational assessment of the performance of total knee replacements
Retrieval, experimental, and computational assessment of the performance of total knee replacements
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DOI：
10.1002/jor.20181
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发表时间：
2006-07
影响因子：
2.8
通讯作者：
J. Rawlinson;B. Furman;Stephen Li;T. Wright;D. Bartel
中科院分区：
文献类型：
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作者：
J. Rawlinson;B. Furman;Stephen Li;T. Wright;D. Bartel
用于全膝关节置换的聚乙烯组件中的磨损机制是固有的机械机制；局部应力或应变超过了某些材料的极限。恢复分析和膝关节模拟器提供了量化体内或体外观察到的损伤的手段。这些结果与使用有限元分析的计算模拟、膝关节模拟器测试和两个膝关节设计的计算模拟所获得的材料应力有间接联系。我们假设，如果在计算模拟中产生等效的加载环境，我们可以将计算的应力分布与模拟器试件的观察到的损伤相关联，并从恢复分析中进一步将设计差异与体内性能联系起来。有限元模型与膝关节模拟器的运动学和动力学在2-13%的范围内吻合，复合材料有限元接触面积与模拟器试件因打磨造成的损伤面积的66%-90%匹配。抛光是模拟器和回收试件的主要损伤模式，与观察到的相对较低的接触应力相对应。计算和实验技术都低估了从检索分析确定的数量，但两种设计之间的差异在所有三种方法中都是一致的。结合这些技术加强了计算模拟的适用性，同时突出了这些方法在临床前测试和评估材料状态和损伤之间的联系的互补方法。©2006矫形外科研究会。由Wiley期刊公司出版，J Orthop Res 24：1384-1394,2006
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. © 2006 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 24:1384–1394, 2006