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Background  Despite growing evidence in the literature, there is still a lack of consensus regarding the use of the mobile-bearing (MB) design total knee arthroplasty (TKA).    Methods  In a prospective, comparative, randomised, single centre trial, 106 patients with end-stage osteoarthritis of the knee were randomised to either an MB or fixed-bearing (FB) group to receive posterior stabilised (PS)-TKA using a standard medial parapatellar approach and patellar resurfacing with follow-up (FU) for 5 years. The primary outcome was anterior knee pain (AKP) during the chair rise test and the stair climb test 5 years after surgery. The secondary outcome was the ability to rise from a chair and to climb stairs, range of motion (ROM), Knee Society Score (KSS), RAND-36 scores and radiological analysis of the patellar tilt.    Results  No statistically significant difference was found between the two groups at 5 years FU in terms of median AKP during the chair rise test and the stair climb test ( p  = 0.5 and  p  = 0.8, respectively). There was no significant difference in any of the other secondary outcome parameters between the groups at 5 years FU.    Conclusion  A mobile-bearing TKA does not decrease AKP compared to fixed bearings.    Trial registration number  ClinicalTrials.gov  NCT02892838 .    Level of evidence  II

bmc musculoskeletal disorders

Comparison of fixed and mobile-bearing total knee arthroplasty in terms of patellofemoral pain and function: a prospective, randomised, controlled trial