Precision of CT-based micromotion analysis is comparable to radiostereometry for early migration measurements in cemented acetabular cups

被引:23
作者
Broden, Cyrus [1 ,2 ]
Sandberg, Olof [3 ]
Olivecrona, Henrik [4 ]
Emery, Roger [1 ]
Skoldenberg, Olof [2 ]
机构
[1] Imperial Coll London, St Marys Hosp, Dept Surg & Canc, London, England
[2] Karolinska Inst, Danderyd Hosp, Div Orthopaed, Dept Clin Sci, Stockholm, Sweden
[3] Sectra, Linkoping, Sweden
[4] Karolinska Inst, Dept Mol Med & Surg, Stockholm, Sweden
关键词
D O I
10.1080/17453674.2021.1906082
中图分类号
R826.8 [整形外科学]; R782.2 [口腔颌面部整形外科学]; R726.2 [小儿整形外科学]; R62 [整形外科学(修复外科学)];
学科分类号
摘要
Background and purpose - CT (computed tomography) based methods have lately been considered an alternative to radiostereometry (RSA) for assessing early implant migration. However, no study has directly compared the 2 methods in a clinical setting. We estimated the precision and effective radiation dose of a CT-based method and compared it with marker-based RSA in 10 patients with hip arthroplasty. Patients and methods - We included 10 patients who underwent total hip replacement with a cemented cup. CT and RSA double examinations were performed postoperatively, and precision and effective dose data were compared. The CT data was analyzed with CT micromotion analysis (CTMA) software both with and without the use of bone markers. The RSA images were analyzed with RSA software with the use of bone markers. Results - The precision of CTMA with bone markers was 0.10-0.16 mm in translation and 0.31 degrees-0.37 degrees in rotation. Without bone markers, the precision of CTMA was 0.10-0.16 mm in translation and 0.21 degrees-0.31 degrees in rotation. In comparison, the precision of RSA was 0.09-0.26 mm and 0.43 degrees-1.69 degrees. The mean CTMA and RSA effective dose was estimated at 0.2 mSv and 0.04 mSv, respectively. Interpretation - CTMA, with and without the use of bone markers, had a comparable precision to RSA. CT radiation doses were slightly higher than RSA doses but still at a considerably low effective dose.
引用
收藏
页码:419 / 423
页数:5
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