Development of a technique for accurately determining clinical wear in explanted total hip replacements
Development of a technique for accurately determining clinical wear in explanted total hip replacements
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DOI：
10.1016/j.wear.2007.01.054
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发表时间：
2007-09-10
期刊：
影响因子：
5
通讯作者：
Jiang, X.
中科院分区：
文献类型：
--
作者：
Bills, P.;Blunt, L.;Jiang, X.
人们早就认识到，全关节置换的磨损分析是确定失效机制、功能和延长这些器械寿命的重要手段。用于评估此类接头中磨损体积的标准化方法是通过重量分析方法，并且已表明该方法是用于指示模拟磨损体积的有用工具。然而，当考虑到临床取出的支承面（根据定义，没有“磨损前”数据）的情况时，这种方法没有多大价值。本研究的目的是提出一种基于坐标测量机（CMM）的技术，用于评估取出的全髋关节置换关节中的体积材料损失并确定其有效性。创建了一个理想化表面的3D CAD模型，该表面代表待测量的髋臼杯的磨损前表面。在这里，提出了两种方法，发现一个很好的估计原始磨损前的表面，这可能会显着不同的理想化的CAD模型。第一种方法使用未磨损的相同部件作为基线测量，第二种方法使用髋臼杯的未磨损部分来创建更准确的“零循环”CAD实体。根据这些磨损前表面，可以直接计算体积材料损失，并以图形方式绘制磨损“疤痕”，即股骨头穿透髋臼杯。(C)2007 Elsevier B.V.保留所有权利。
It has long been recognised that wear analysis of total joint replacements is an important means in determining failure mechanisms, functionality and improving longevity of these devices. The standardised method for assessing wear volumes in such joints is through gravimetric means and it has been shown that this method is a useful tool for indicating simulated wear volumes. This method is, however, of little value when considering the case of a clinically explanted bearing surface for which, by definition, there is no 'pre-wear' data.The purpose of this study is to present a co-ordinate measuring machine (CMM) based technique for assessing the volumetric material loss in explanted total hip replacement joints and to establish its effectiveness. A 3D CAD model was created of an idealised surface representing the pre-wear surface of the explanted acetabular cup to be measured. Here, two methods are proposed for discovery of a good estimate of the original pre-wear surface, which may differ significantly from the idealised CAD model. The first uses an unworn identical component as a baseline measurement and the second utilises the unworn portion of the explanted acetabular cup to create a more accurate 'zero-cycle' CAD entity. From these pre-wear surfaces, it is possible to directly calculate volumetric material loss and to graphically map the wear 'scar', i.e. the penetration of the femoral head into the acetabular cup. (C) 2007 Elsevier B.V. All rights reserved.