Volumetric wear assessment of retrieved metal-on-metal hip prostheses and the impact of measurement uncertainty
Volumetric wear assessment of retrieved metal-on-metal hip prostheses and the impact of measurement uncertainty
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DOI：
10.1016/j.wear.2011.08.030
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发表时间：
2012-01-27
期刊：
影响因子：
5
通讯作者：
Blunt, L.
中科院分区：
文献类型：
--
作者：
Bills, P. J.;Racasan, R.;Blunt, L.
在髋关节置换术中，为了延长部件使用寿命，鼓励使用硬质关节面材料，已证明硬质关节面材料的磨损率低于传统金属-UHMWPE组合。为了进一步延长关节活动的时间，已经开发了金属对金属髋关节表面置换术，允许植入更年轻和更活跃的患者。然而，由于不明原因的髋关节疼痛和报告的软组织反应，这些关节面最近已成为MHRA器械警报的主题，实际上正在调查中，已显示出较高的失效率。由于目前还没有专门用于测量此类磨损的标准，因此，这突出了对体内磨损量化和表征的可追溯性方法的需求。本研究首次开发了一种全面的方法，用于测量取出的关节面的磨损几何形状，同时还评估和量化三种磨损的幅度和影响。尺寸测量不确定度对整个测量过程的影响。这项研究表明，扩展测量不确定度的大小是一个重要的，直到现在还被忽视，不确定性声明在测量检索的成分时至关重要，可作为研究之间的比较手段和测量数据的置信度衡量标准。根据本研究的结果，建议在对取出的关节面进行磨损测量时应小心。诸如点间距和扫描线分离的因素可能对所获得的测量结果的可能不确定性具有很大影响，并且实际上测量的不确定性可以与被测量的磨损具有相同的量级。(C)2011 Elsevier B. V.保留所有权利。
In hip replacement the use of hard bearing materials, which have been shown to have lower wear rates than traditional metal-UHMWPE couples, has been encouraged in an effort to extend component life-in-service. With a view to further extending this period of joint activity metal-on-metal hip resurfacings have been developed which allow for implantation into younger and more active patients. However, these bearings have recently been the subject of a MHRA device alert due to unexplained hip pain and reported soft tissue reactions and indeed are under investigation having been shown to exhibit high failure rates. This has highlighted the need for a traceable metrological approach to the quantification and characterization of in vivo wear as currently there is no standard dedicated to the measurement of such wear.This study is the first to develop a comprehensive method for measuring the wear geometry of retrieved bearings whilst also assessing and quantifying both the magnitude and effect of the three-dimensional measurement uncertainty on the measurement process as a whole.This study shows that the magnitude of the expanded measurement uncertainty is an important, and until now overlooked, factor and that a statement of uncertainty is vital in measuring retrieved components as a means of comparison between studies and as a measure of confidence in measurement data.Based on the results of this study, it is recommended that care be taken when performing wear measurements on retrieved bearings. Factors such as point pitch and scan line separation can have a great effect on the likely uncertainty of the obtained measurement result and indeed the uncertainty of the measurement can be of the same order as the wear being measured. (C) 2011 Elsevier B.V. All rights reserved.