National Institute of Advanced Industrial Science and Technology, 1-1 Higashi 1-chome, Tsukuba, Ibaraki 305-8566, Japan.
J Mech Behav Biomed Mater. 2014 Mar;31:152-63. doi: 10.1016/j.jmbbm.2013.10.021. Epub 2013 Nov 13.
The effects of articular head size on the wear losses of the metal insert and articular head for a metal-on-metal bearing were examined using a hip simulator manufactured to satisfy ISO 14242-1. The wear properties of metal-on-metal and metal-on-polyethylene bearings were also compared under the same conditions. The total wear losses of the metal insert and articular head decreased with increasing diameter of the metal insert in the range from 28 to 44mm. The total wear loss was greater for a diameter of 48mm than for a diameter of 44mm. When the articular metal insert diameter was smaller than 44mm, the wear loss was reduced because the contact surface pressure increased with increasing metal insert diameter. However, the increase in wear loss observed for the 48-mm-diameter insert might have been due to the considerable increase in the rotation moment with increasing insert diameter. The tendency of decreasing contact pressure calculated using the Hertzian contact stress equation nearly conformed to the change in wear loss. On the other hand, the wear loss of an artificial hip joint consisting of a cross-linked ultrahigh-molecular-weight polyethylene insert (UHMWPE) and a Co-Cr-Mo articular head was small.
使用满足 ISO 14242-1 标准的髋关节模拟器，研究了关节头尺寸对金属对金属关节轴承中金属嵌体和关节头的磨损损失的影响。还在相同条件下比较了金属对金属和金属对聚乙烯关节轴承的磨损性能。在 28 至 44mm 范围内，金属嵌体直径的增加会导致金属嵌体和关节头的总磨损损失减少。直径为 48mm 的总磨损损失大于直径为 44mm 的总磨损损失。当关节金属嵌体直径小于 44mm 时，由于接触表面压力随金属嵌体直径的增加而增加，因此磨损损失减少。然而，对于直径为 48mm 的嵌体，观察到的磨损损失增加可能是由于插入物直径增加导致旋转力矩大大增加。使用赫兹接触应力方程计算的接触压力减小趋势与磨损损失的变化几乎一致。另一方面，由交联超高分子量聚乙烯嵌体（UHMWPE）和 Co-Cr-Mo 关节头组成的人工髋关节的磨损损失很小。
