RSA wear measurements with or without markers in total hip arthroplasty
RSA wear measurements with or without markers in total hip arthroplasty
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DOI：
10.1016/j.jbiomech.2005.05.004
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发表时间：
2006-01-01
影响因子：
2.4
通讯作者：
Bragdon, CR
中科院分区：
文献类型：
--
作者：
Börlin, N;Röhrl, SM;Bragdon, CR
本文提出了一种新的放射立体测量（RSA）算法，并在20例全髋关节置换术患者的体模图像和临床双重检查上进行了评价，用经典的RSA和三种新算法进行了分析：（1）双投影头算法，利用股骨头轮廓和髋臼杯内标记;（2）基于股骨头轮廓、髋臼杯外壳和髋臼杯开口圆测量的无标记算法;（3）两种方法的组合。新算法改进了当前基于标记的RSA测量，并允许在无标记髋臼杯的情况下进行研究。这开辟了在临床随访甚至回顾性研究中对更大规模的患者进行磨损测量的可能性。新的算法可能有助于保存当前RSA研究中因髋臼杯标记不充分而丢失的患者数据。最后，新的算法简化了RSA程序，允许在没有标记物的情况下进行新的研究，节省了时间，金钱，并减少了安全问题。其他潜在用途包括重新表面化股骨头的移位测量和测量球形部分作为植入物标志而不是标记。(c)2005爱思唯尔有限公司保留所有权利。
Novel algorithms for radiostereometric (RSA) measurements of the femoral head and metal-backed, hemi-spherical cups of a total hip replacement are presented and evaluated on phantom images and clinical double examinations of 20 patients.The materials were analysed with classical RSA and three novel algorithms: (1) a dual-projection head algorithm using the outline of the femoral head together with markers in the cup; (2) a marker-less algorithm based on measurements of the outline of the femoral head, the cup shell and opening circle of the cup; and (3) a combination of both methods.The novel algorithms improve current, marker-based, RSA measurements, as well as allows studies without marked cups. This opens the possibility of performing wear measurements on larger group of patients, in clinical follow-ups, even retrospective studies. The novel algorithms may help to save patient data in current RSA studies lost due to insufficiently marked cups. Finally, the novel algorithms simplify the RSA procedure and allow new studies without markers, saving time, money, and reducing safety concerns. Other potential uses include migration measurements of re-surfacing heads and measuring spherical sections as implant landmarks instead of markers. (c) 2005 Elsevier Ltd. All rights reserved.