Imaging Research Laboratories, Robarts Research Institute, The University of Western Ontario, London, Ontario, Canada.
J Arthroplasty. 2010 Feb;25(2):330-2. doi: 10.1016/j.arth.2009.11.001. Epub 2009 Dec 21.
Micro-computed tomography (micro-CT) has previously been validated for measuring wear volume in polyethylene acetabular liners. The creation of 3-dimensional (3D) articular and backside surface deviation maps using micro-CT is described. An acetabular liner was retrieved after 16.7 years of implantation and scanned with micro-CT along with a new, never-implanted liner of the same size and type. The liner surface geometries were reconstructed and co-aligned. A 3D comparison and cross-sectional analysis was performed. Maximum 3D deviation of the articular surface was -2.48 +/- 0.02 mm, with maximum backside deviation of 0.46 +/- 0.02 mm. Micro-CT can measure surface deviation and therefore calculate the volume of wear plus creep of retrieved acetabular liners, and may be applicable for wear simulator studies and analyzing other polyethylene components including tibial inserts.
微计算机断层扫描（micro-CT）以前已被验证可用于测量聚乙烯髋臼衬垫的磨损体积。本文描述了使用 micro-CT 创建 3 维（3D）关节和背面表面偏差图的方法。从植入后 16.7 年的髋臼衬垫中取出一个，并使用 micro-CT 对其进行扫描，同时扫描一个相同尺寸和类型的全新、从未植入的衬垫。对衬垫表面几何形状进行了重建和配准。进行了 3D 比较和横截面分析。关节表面的最大 3D 偏差为-2.48 +/- 0.02 毫米，背面最大偏差为 0.46 +/- 0.02 毫米。micro-CT 可测量表面偏差，因此可以计算已回收髋臼衬垫的磨损加蠕变体积，并且可能适用于磨损模拟器研究和分析包括胫骨插入物在内的其他聚乙烯部件。
