PURPOSE: An ongoing controversy exists on whether mobile-bearing design is superior over fixed-bearing design in unicondylar knee arthroplasties (UKAs). The present study conducted a systematic review to ascertain differences in performance between fixed- and mobile-bearing designs in UKAs. METHODS: A literature search was performed in PubMed, Embase, Scopus and the Cochrane Library. A total of 9 comparative studies involving 915 knees comparing outcomes of mobile-bearing UKAs with fixed-bearing UKAs were included in the current analysis. Outcomes of interest included knee function, quality of life, radiographic outcomes, reasons and incidence of reoperation, timing of failures, and survivorship. RESULTS: The results presented no significant differences between the two designs in terms of knee scores, range of motion, limb alignment, implant positioning, incidence of radiolucent lines and overall reoperation rates. However, their differences have been noted in their modes and timing of failures. Early failures are related to the risk of bearing dislocation in the mobile-bearing design. In contrast, later failures are related to the risk of polyethylene wear in the fixed-bearing design. CONCLUSIONS: The available evidence has not confirmed the advantage of mobile-bearing UKAs over fixed-bearing UKAs but pointed out specific modes of failure.
PURPOSE: An ongoing controversy exists on whether mobile-bearing design is superior over fixed-bearing design in unicondylar knee arthroplasties (UKAs). The present study conducted a systematic review to ascertain differences in performance between fixed- and mobile-bearing designs in UKAs. METHODS: A literature search was performed in PubMed, Embase, Scopus and the Cochrane Library. A total of 9 comparative studies involving 915 knees comparing outcomes of mobile-bearing UKAs with fixed-bearing UKAs were included in the current analysis. Outcomes of interest included knee function, quality of life, radiographic outcomes, reasons and incidence of reoperation, timing of failures, and survivorship. RESULTS: The results presented no significant differences between the two designs in terms of knee scores, range of motion, limb alignment, implant positioning, incidence of radiolucent lines and overall reoperation rates. However, their differences have been noted in their modes and timing of failures. Early failures are related to the risk of bearing dislocation in the mobile-bearing design. In contrast, later failures are related to the risk of polyethylene wear in the fixed-bearing design. CONCLUSIONS: The available evidence has not confirmed the advantage of mobile-bearing UKAs over fixed-bearing UKAs but pointed out specific modes of failure.
Authors: Alex Schallberger; Matthias Jacobi; Peter Wahl; Gianluca Maestretti; Roland P Jakob Journal: Knee Surg Sports Traumatol Arthrosc Date: 2010-09-07 Impact factor: 4.342
Authors: Geoffrey F Dervin; Chris Carruthers; Robert J Feibel; Alan A Giachino; Paul R Kim; Peter R Thurston Journal: J Arthroplasty Date: 2010-07-29 Impact factor: 4.757
Authors: Annette W-Dahl; Otto Robertsson; Lars Lidgren; Lisa Miller; David Davidson; Stephen Graves Journal: Acta Orthop Date: 2010-02 Impact factor: 3.717
Authors: J P van der List; H Chawla; J C Villa; H A Zuiderbaan; A D Pearle Journal: Knee Surg Sports Traumatol Arthrosc Date: 2015-11-26 Impact factor: 4.342
Authors: Arun Kannan; Peter L Lewis; Chelsea Dyer; William A Jiranek; Stephen McMahon Journal: Clin Orthop Relat Res Date: 2021-07-01 Impact factor: 4.755