Hyde Philip J, Fisher John, Hall Richard M
Institute of Medical and Biological Engineering, University of Leeds, Leeds, UK.
J Biomed Mater Res B Appl Biomater. 2017 Jan;105(1):46-52. doi: 10.1002/jbm.b.33456. Epub 2015 Sep 28.
The effect of kinematics, loading and centre of rotation on the wear of an unconstrained total disc replacement have been investigated using the ISO 18192-1 standard test as a baseline. Mean volumetric wear rate and surface morphological effects were reported. Changing the phasing of the flexions to create a low (but finite) amount of crossing path motion at the bearing surfaces resulted in a significant fall in wear volume. However, the rate of wear was still much larger than previously reported values under zero cross shear conditions. Reducing the load did not result in a significant change in wear rate. Moving the centre of rotation of the disc inferiorly did significantly increase wear rate. A phenomenon of debris re-attachment on the UHMWPE surface was observed and hypothesised to be due to a relatively harsh tribological operating regime in which lubricant replenishment and particle migration out of the bearing contact zone were limited. © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B: 46-52, 2017.
以ISO 18192-1标准测试为基线，研究了运动学、载荷和旋转中心对无约束全椎间盘置换假体磨损的影响。报告了平均体积磨损率和表面形态学效应。改变屈曲的相位以在轴承表面产生少量（但有限）的交叉路径运动，导致磨损量显著下降。然而，磨损率仍远高于先前报道的零交叉剪切条件下的值。降低载荷并未导致磨损率发生显著变化。将椎间盘的旋转中心向下移动确实显著增加了磨损率。观察到超高分子量聚乙烯（UHMWPE）表面存在碎屑重新附着的现象，并推测这是由于相对恶劣的摩擦学工作状态，其中润滑剂补充和颗粒从轴承接触区移出受到限制。©2015威利期刊公司。《生物医学材料研究杂志》B部分：应用生物材料，105B：46-52，2017年。
