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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Validation of a micro-CT technique for measuring volumetric wear in retrieved acetabular liners.
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Validation of a micro-CT technique for measuring volumetric wear in retrieved acetabular liners.

机译：用于测量髋臼内衬中体积磨损的微型CT技术的验证。

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摘要

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 1,024 x 1,024 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.
机译：在这项研究中，引入并验证了一种基于微型CT的新型技术，用于评估髋臼内衬的磨损。收集了六个UHMWPE髋臼组件，其植入时间为2.7至14.4年，并使用高分辨率micro-CT扫描仪进行了评估。使用1,024 x 1,024的面内图像矩阵，以74微米（16位精度）的均匀体积分辨率扫描组件。由训练有素的观察者对髋臼杯的内部半球形部分进行几何形状的人工刚性3D图像配准，以实现磨损量的隔离，可视化和测量。这六个组件的结果表明平均磨损率为65 mm（3）/年。总体扫描仪误差通过重量分析法定量，最大不确定度为0.6％。观察者内部和观察者之间的不确定性分析表明，该方法既准确又可重复。

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