Validation of a micro-CT technique for measuring volumetric wear in retrieved acetabular liners
Validation of a micro-CT technique for measuring volumetric wear in retrieved acetabular liners
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DOI：
10.1002/jbm.b.30318
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发表时间：
2005-10-01
影响因子：
3.4
通讯作者：
Edidin, AA
中科院分区：
文献类型：
--
作者：
Bowden, AE;Kurtz, SM;Edidin, AA
在本研究中，引入并验证了一种用于评价回收髋臼内衬磨损的新型显微CT技术。使用高分辨率微型CT扫描仪收集并评价了植入时间从2.7年到14.4年的6个UHMWPE髋臼部件。使用1024 X 1024平面内图像矩阵，以74微米（16位精度）的均匀体积分辨率扫描组件。由经过培训的观察员使用几何图元对髋臼杯内部半球部分进行手动刚性3D图像配准，以隔离、可视化和测量磨损体积。这6个部件的结果表明平均磨损率为65 mm（3）/年。整体扫描仪误差进行定量重量分析，并与0.6%的最大不确定性。观察者内和观察者间的不确定度分析表明，该方法是准确的和可重复的。(c)2005 Wiley Periodicals，Inc.
In this study, a novel micro-CT-based technique for evaluating wear in retrieved acetabular liners was introduced and validated. Six UHMWPE acetabular components ranging in implantation time from 2.7 to 14.4 years were collected and evaluated with the use of a high-resolution micro-CT scanner. The components were scanned with a uniform volumetric resolution of 74 microns (16-bit precision) with the use of a 1024 X 1024 in-plane image matrix. Manual rigid 3D image registration of the interior hemispherical portion of the acetabular cup with geometric primitives by trained observers allowed for isolation, visualization, and measurement of the wear volume. Results for these six components indicated an average wear rate of 65 mm(3)/year. Overall scanner error was quantified gravimetrically and associated with a maximum uncertainty of 0.6%. Intra- and interobserver uncertainty analysis showed the method to be both accurate and repeatable. (c) 2005 Wiley Periodicals, Inc.