Precision of low-dose CT-based micromotion analysis technique for the assessment of early acetabular cup migration compared with gold standard RSA: a prospective study of 30 patients up to 1 year

• DOI: 10.2340/17453674.2022.2528
• Publication Date: 2022-04-28T07:54:25Z
• Authors: Vasileios Angelom...; Maziar Mohaddes; Raed Itayem; Bita Shareghi
• Keywords: Gold standard (test)

Background and purpose: Computed tomography micromotion analysis (CTMA) can be used to determine implant micro-movements using low-dose CT scans. By CTMA, a non-invasive measurement of joint movement is enabled. We evaluated the precision CTMA in measuring early cup migration. Standard marker-based radiostereometric (RSA) was as reference. hypothesised that an alternative RSA assessing micromotions.Patients methods: included 30 patients undergoing total hip arthroplasty (THA). Acetabular migration at 1 year measured with CTMA. To both methods, 20 double examinations (postoperatively) repositioning were performed. The calculated from zero by assuming there no motion prosthesis between 2 examinations.Results: ranged 0.06 0.15 mm for translations 0.21° 0.63° rotations. Corresponding values 0.13 0.23° 0.35°. A good level agreement found methods regarding rotation year.Interpretation: acetabular comparable RSA. could possibly thus method detect