Comparison of wear in a total knee replacement under different kinematic conditions
Comparison of wear in a total knee replacement under different kinematic conditions
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DOI：
10.1023/a:1012894023657
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发表时间：
2001-01-01
影响因子：
3.7
通讯作者：
Ingham, E
中科院分区：
文献类型：
--
作者：
Barnett, PI;Fisher, J;Ingham, E
使用六站ProSim（Manchester，UK）膝关节模拟器评估6个PFC（DePuy）固定平台全膝关节置换系统在两种不同运动学条件（定义为低和高运动学输入）下的磨损。高运动学位移和旋转输入基于自然膝关节的运动学，ISO标准用于轴向载荷和屈曲。低运动学被定义为大约一半的幅度。6个样本在低运动学下运行300万次循环，在高运动学下运行300万次循环。在低运动学阶段发现的平均磨损率为7.7 +/-2 mm（3）/百万次循环。然后，在高运动学输入阶段，平均磨损率显著增加至41 +/-14 mm（3）。磨损区域的特点是由一个主要的损伤模式的抛光与一些磨料磨损发生在高运动学阶段。本研究支持通过引入旋转和前/后位移来引入聚乙烯交叉剪切会增加磨损率的结果。这对需要膝关节置换的活动水平较高的年轻患者有影响。(C)2001 Kluwer Academic Publishers.
A six station ProSim (Manchester, UK) knee simulator was used to assess the wear of six PFC (DePuy) fixed bearing total knee replacements under two different kinematic conditions defined as low and high kinematic inputs. The high kinematics displacement and rotation inputs were based on the kinematics of the natural knee with ISO standards used for the axial load and flexion. Low kinematics were defined as approximately half the magnitude. The six specimens were run for three million cycles under low kinematics and three million cycles under high kinematics. The mean wear rate found during the low kinematics phase was 7.7 +/- 2mm(3) per million cycles. This then increased significantly to an average wear rate of 41 +/- 14mm(3) during the high kinematics input phase. The wear areas were characterized by a predominant damage mode of burnishing with some abrasive wear occurring during the high kinematics phase. This study supports the findings that introduction of cross-shearing of the polyethylene by introducing both rotational and anterior/posterior displacement increases the wear rate. This has implications for younger patients with higher levels of activity that need knee replacements. (C) 2001 Kluwer Academic Publishers.