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首页> 外文期刊>Acta Radiologica >Accuracy and precision of a CT method for assessing migration in shoulder arthroplasty: an experimental study
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Accuracy and precision of a CT method for assessing migration in shoulder arthroplasty: an experimental study

机译：肩关节置换术评估迁移的CT方法的准确性和精度：实验研究

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Background Radiostereometric analysis (RSA) is the gold standard to measure early implant migration which is a predictive factor for implant survival. Purpose To validate an alternative computed tomography (CT) technique to measure implant migration in shoulder arthroplasty. Material and Methods A cadaver proximal humerus and a scapula, which had tantalum beads incorporated within them, were prepared to accept a short-stemmed humeral component and a two-pegged glenoid component of a commercial total shoulder arthroplasty (TSA) system. A five degree of freedom micrometer and goniometer equipped rig was used to translate and rotate the implant components relative to the respective bone to predetermined positions. Double CT examinations were performed for each position and CT motion analysis software (CTMA) was used to assess these movements. The accuracy and precision of the software was estimated using the rig's micrometers and goniometers as the gold standard. The technique's effective dose was also assessed. Results The accuracy was in the range of 0.07-0.23 mm in translation and 0.22-0.71 degrees in rotation. The precision was in the range of 0.08-0.15 mm in translation and 0.23-0.54 degrees in rotation. The mean effective dose for the CT scans was calculated to be 0.27 mSv. Conclusion In this experimental setting, accuracy, precision, and effective dose of the CTMA technique were found to be comparable to that of RSA. Therefore, we believe clinical studies are warranted to determine if CTMA is a suitable alternative to traditional RSA for migration measurements in TSA.
机译：背景技术辐射静脉分析（RSA）是测量早期种植体迁移的金标准，这是植入物存活的预测因素。目的验证替代计算断层扫描（CT）技术，以测量肩部关节成形术中的植入物迁移。材料和方法制备尸体肱骨和肩胛骨的尸体和方法制备含有钽珠的肩胛骨，以接受短止期的肱骨部件和商业总肩部关节置换术（TSA）系统的双重关节盂组分。使用五个自由度千分尺和装备的装备钻头用于将植入物组分相对于各个骨转换并旋转到预定位置。对每个位置进行双CT检查，并且CT运动分析软件（CTMA）用于评估这些运动。使用钻机的微米和测功仪作为金标准来估计软件的准确性和精度。该技术的有效剂量也被评估。结果精度在0.07-0.23mm的翻译范围内，旋转0.22-0.71度。该精度在0.08-0.15mm的翻译范围内，旋转0.23-0.54度。 CT扫描的平均有效剂量计算为0.27msV。结论在这种实验环境中，发现CTMA技术的准确性，精度和有效剂量的含量与RSA的实验。因此，我们认为有必要临床研究来确定CTMA是否是TSA中迁移测量的传统RSA的合适替代品。

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