title: Higher forgotten joint score for fixed-bearing than for mobile-bearing total knee arthroplasty.
abstract: OBJECTIVE
  To compare the postoperative subjective outcome for fixed- and mobile-bearing total knee arthroplasty (TKA) by using the forgotten joint score (FJS-12), a new patient-reported outcome score of 12 questions evaluating the potential of a patient to forget about his operated joint. The hypothesis of this study was that a mobile-bearing TKA would have a higher level of forgotten joint than a fixed-bearing model of the same design.
  
  
  METHODS
  A retrospective cohort study was conducted in 100 patients who underwent TKA at least 1 year [mean (SD) 18 (5) months] before with either a fixed-bearing (N = 50) or a mobile-bearing (N = 50) TKA from the same implant family. Clinical outcome was evaluated with the knee society score and patient-reported outcome with the forgotten joint score.
  
  
  RESULTS
  No difference was observed for demographics in between both study groups. The mean (SD) postoperative FJS-12 for the fixed-bearing TKA was 71 (28) compared to a mean (SD) of 56.5 (30) for the mobile-bearing TKA.
  
  
  CONCLUSIONS
  The clinical relevance of the present retrospective study is that it shows for the first time a significant difference between fixed- and mobile-bearing TKA by using a new patient-reported outcome score. The hypothesis that mobile-bearing TKA would have a higher degree of forgotten joint than a fixed-bearing TKA could not be confirmed. A level I prospective study should be set up to objectivise these findings.
  
  
  METHODS
  IV.
authors.affiliation: Cliniques Universitaires Saint Luc-UCL, Av. Hippocrate 10, 1200, Brussels, Belgium. emmanuel.thienpont@uclouvain.be.
authors.forename: E
authors.initials: E
authors.lastname: Thienpont
authors.affiliation: CHU-Tivoli, La Louvière, Belgium.
authors.forename: D
authors.initials: D
authors.lastname: Zorman
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation*; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000502:physiology / Q000601:surgery; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000503:physiopathology / Q000601:surgery; D000071066:Patient Reported Outcome Measures; D011184:Postoperative Period; D011474:Prosthesis Design; D016059:Range of Motion, Articular; D012189:Retrospective Studies
keywords: Fixed bearing; Forgotten joint score; Mobile bearing; Total knee arthroplasty