High-precision measurements of cementless acetabular components using model-based RSA - An experimental study
High-precision measurements of cementless acetabular components using model-based RSA - An experimental study
复制标题
DOI：
10.1080/17453670710014095
复制
发表时间：
2007-01-01
影响因子：
3.7
通讯作者：
Soballe, Kjeld
中科院分区：
文献类型：
--
作者：
Baad-Hansen, Thomas;Kold, Soren;Soballe, Kjeld
背景在RSA中，由于金属髋臼杯的高密度，附着在金属背衬髋臼杯上的钽标记通常难以在立体X线片上检测到。这导致假体标记闭塞，并可能导致不确定的移位结果。在过去的几年里，已经开发了新的软件系统来解决这个问题。我们比较了3个RSA系统在髋臼组件的迁移analysis的精度。材料和方法一个半球形和非半球形髋臼组件安装在一个幻影。两个髋臼组件进行迁移分析与3个不同的RSA系统：传统的RSA使用钽标记，RSA系统使用半球形杯算法，和一个新的基于模型的RSA system.Results我们发现窄的置信区间，表明高精度的传统标记系统和基于模型的RSA方面的迁移和旋转。传统RSA和基于模型的RSA的置信区间比基于半球杯算法的系统在杯迁移和旋转方面的置信区间更窄。解释基于模型的RSA软件结合了传统RSA软件的精确性和基于半球杯算法的系统的方便性。根据我们的研究结果，我们认为这些新工具在测量髋臼部件移位方面提供了改进。
Background In RSA, tantalum markers attached to metal-backed acetabular cups are often difficult to detect on stereo radiographs due to the high density of the metal shell. This results in occlusion of the prosthesis markers and may lead to inconclusive migration results. Within the last few years, new software systems have been developed to solve this problem. We compared the precision of 3 RSA systems in migration analysis of the acetabular component.Material and methods A hemispherical and a non-hemispherical acetabular component were mounted in a phantom. Both acetabular components underwent migration analyses with 3 different RSA systems: conventional RSA using tantalum markers, an RSA system using a hemispherical cup algorithm, and a novel model-based RSA system.Results We found narrow confidence intervals, indicating high precision of the conventional marker system and model-based RSA with regard to migration and rotation. The confidence intervals of conventional RSA and model-based RSA were narrower than those of the hemispherical cup algorithm-based system regarding cup migration and rotation.Interpretation The model-based RSA software combines the precision of the conventional RSA software with the convenience of the hemispherical cup algorithm-based system. Based on our findings, we believe that these new tools offer an improvement in the measurement of acetabular component migration.