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- Title
No difference in terms of radiostereometric analysis between fixed- and mobile-bearing total knee arthroplasty: a randomized, single-blind, controlled trial.
- Authors
Schotanus, M.; Pilot, P.; Kaptein, B.; Draijer, W.; Tilman, P.; Vos, R.; Kort, N.; Schotanus, M G M; Kaptein, B L; Draijer, W F; Tilman, P B J; Kort, N P
- Abstract
<bold>Purpose: </bold>A concern that arises with any new prosthesis is whether it will achieve satisfactory long-term implant stability. The gold standard of assessing the quality of fixation in a new or relatively new implant is to undertake a randomized controlled trial using radiostereometric analysis. It was hypothesized that both mobile-bearing total knee arthroplasty and fixed-bearing total knee arthroplasty have comparable migration patterns at 2-year follow-up. This study investigated two types of cemented total knee arthroplasty, the mobile- or fixed-bearing variant from the same family with use of radiostereometric analysis.<bold>Methods: </bold>This prospective, patient-blinded, randomized, controlled trial was designed to investigate early migration of the tibia component after two years of follow-up with use of radiostereometric analysis. A total of 50 patients were randomized to receive a mobile- or fixed-bearing TKA from the same family. Patients were evaluated during 2-year follow-up, including radiostereometric analysis, physical and clinical examination and patient reported outcome measures (PROMs).<bold>Results: </bold>At two-year follow-up, the mean (±SD) maximum total point motion (MTPM) in the fixed-bearing group was 0.82 (±1.16) versus 0.92 mm (±0.64) in the mobile-bearing group (p = n.s) with the largest migration seen during the first 6 weeks (0.45 ± 0.32 vs. 0.54 ± 0.30). The clinical outcome and PROMs significantly improved within each group, not between both groups.<bold>Conclusions: </bold>Measuring early micromotion is useful for predicting clinical loosening that can lead to revision. The results of this study demonstrate that early migration of the mobile-bearing is similar to that of the fixed-bearing component at two years and was mainly seen in the first weeks after implantation.<bold>Level Of Evidence: </bold>Randomized, single-blind, controlled trial, Level I.
- Subjects
TOTAL knee replacement; RADIOSTEREOMETRY; PROSTHETICS; TIBIA; RANDOMIZED controlled trials; ARTIFICIAL joints; COMPARATIVE studies; KNEE; LONGITUDINAL method; RESEARCH methodology; MEDICAL cooperation; RESEARCH; EVALUATION research; BLIND experiment; EQUIPMENT &; supplies
- Publication
Knee Surgery, Sports Traumatology, Arthroscopy, 2017, Vol 25, Issue 9, p2978
- ISSN
0942-2056
- Publication type
journal article
- DOI
10.1007/s00167-016-4138-6