Migration and clinical outcome of mobile-bearing versus fixed-bearing single-radius total knee arthroplasty
DOI:
https://doi.org/10.1080/17453674.2018.1429108Abstract
Background and purpose — Mobile-bearing total knee prostheses (TKPs) were developed in the 1970s in an attempt to increase function and improve implant longevity. However, modern fixed-bearing designs like the single-radius TKP may provide similar advantages. We compared tibial component migration measured with radiostereometric analysis (RSA) and clinical outcome of otherwise similarly designed cemented fixed-bearing and mobile-bearing single-radius TKPs. Patients and methods — RSA measurements and clinical scores were assessed in 46 randomized patients at baseline, 6 months, 1 year, and annually thereafter up to 6 years postoperatively. A linear mixed-effects model was used to analyze the repeated measurements. Results — Both groups showed comparable migration (p = 0.3), with a mean migration at 6-year follow-up of 0.90 mm (95% CI 0.49–1.41) for the fixed-bearing group compared with 1.22 mm (95% CI 0.75–1.80) for the mobile-bearing group. Clinical outcomes were similar between groups. 1 fixed-bearing knee was revised for aseptic loosening after 6 years and 2 knees (1 in each group) were revised for late infection. 2 knees (1 in each group) were suspected for loosening due to excessive migration. Another mobile-bearing knee was revised after an insert dislocation due to failure of the locking mechanism 6 weeks postoperatively, after which study inclusion was preliminary terminated. Interpretation — Fixed-bearing and mobile-bearing single-radius TKPs showed similar migration. The latter may, however, expose patients to more complex surgical techniques and risks such as insert dislocations inherent to this rotating-platform design.Downloads
Download data is not yet available.
Downloads
Additional Files
Published
2018-03-04
How to Cite
Van Hamersveld, K. T., Marang-Van De Mheen, P. J., Van Der Heide, H. J. L., Van Der Linden-Van Der Zwaag, H. M. J., Valstar, E. R., & Nelissen, R. G. H. H. (2018). Migration and clinical outcome of mobile-bearing versus fixed-bearing single-radius total knee arthroplasty. Acta Orthopaedica, 89(2), 190–196. https://doi.org/10.1080/17453674.2018.1429108
Issue
Section
Articles
License
Copyright (c) 2018 Koen T Van Hamersveld, Perla J Marang-Van De Mheen, Huub J L Van Der Heide, Henrica M J Van Der Linden-Van Der Zwaag, Edward R Valstar, Rob G H H Nelissen
This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License.
Acta Orthopaedica (Scandinavica) content is available freely online as from volume 1, 1930. The journal owner owns the copyright for all material published until volume 80, 2009. As of June 2009, the journal has however been published fully Open Access, meaning the authors retain copyright to their work. As of June 2009, articles have been published under CC-BY-NC or CC-BY licenses, unless otherwise specified.