title: Joint awareness in osteoarthritis of the hip and knee evaluated with the 'Forgotten Joint' Score before and after joint replacement.
abstract: OBJECTIVE
  To utilize the 'Forgotten Joint' Score (FJS), a 12-item questionnaire analysing the ability to forget the joint, for comparing preoperative status in osteoarthritic patients scheduled for total hip arthroplasty (THA) or total knee arthroplasty (TKA). Higher scores represent a better result with a maximum of 100. The hypothesis of this study was that a preoperative difference in favour of hip arthritis could eventually explain why THA is cited more often as a forgotten joint than TKA.
  
  
  METHODS
  A prospective cohort study was conducted in 150 patients with either tricompartmental knee (n = 75) or hip osteoarthritis (n = 75). Patients completed FJS-12 scores preoperatively and 1 year postoperatively.
  
  
  RESULTS
  A similar preoperative FJS-12 was observed for hip (22 (15)) and knee osteoarthritis (24 (17)) (n.s.). The postoperative FJS-12 score was significantly higher for THA (80 (24)) than for TKA (70 (27)) (p < 0.05). High reliability after 6 weeks was observed for the preoperative FJS-12 test-retest reliability (ICC = 0.87) in TKA. A preoperative floor effect of 15 % in THA and 0 % in TKA was found as well as a postoperative ceiling effect of 33 % in THA and 9 % in TKA.
  
  
  CONCLUSIONS
  The clinical relevance of utilizing the FJS-12 as an instrument to evaluate outcome is strongly proposed for knee arthroplasty. In general, one is not aware of a healthy joint during the ADL, and it can therefore be regarded as 'forgotten'. The preoperative FJS-12 Score is a powerful tool to provide patients with clearer insights into their positive evolution after surgery. The use of the FJS-12 in THA is a topic for further research, as this study found that floor and ceiling effects limit its usefulness in studies evaluating clinical outcome in this area.
  
  
  METHODS
  II.
authors.affiliation: Department of Orthopaedic Surgery, University Hospital Saint Luc, Avenue Hippocrate 10, 1200, Brussels, Belgium. emmanuel.thienpont@uclouvain.be.
authors.forename: E
authors.initials: E
authors.lastname: Thienpont
authors.affiliation: Department of Orthopaedic Surgery, University Hospital Saint Luc, Avenue Hippocrate 10, 1200, Brussels, Belgium.
authors.forename: A
authors.initials: A
authors.lastname: Vanden Berghe
authors.affiliation: Department of Orthopaedic Surgery, University Hospital Saint Luc, Avenue Hippocrate 10, 1200, Brussels, Belgium.
authors.forename: P E
authors.initials: PE
authors.lastname: Schwab
authors.affiliation: Department of Orthopaedic Surgery, CHU Ambroise Paré, Mons, Belgium.
authors.forename: J P
authors.initials: JP
authors.lastname: Forthomme
authors.affiliation: Department of Orthopaedic Surgery, University Hospital Saint Luc, Avenue Hippocrate 10, 1200, Brussels, Belgium.
authors.forename: O
authors.initials: O
authors.lastname: Cornu
mesh_terms: D000368:Aged; D019644:Arthroplasty, Replacement, Hip; D019645:Arthroplasty, Replacement, Knee; D005260:Female; D006621:Hip Joint / Q000601:surgery; D006801:Humans; D007719:Knee Joint / Q000601:surgery; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000175:diagnosis / Q000601:surgery*; D020370:Osteoarthritis, Knee / Q000175:diagnosis / Q000601:surgery*; D000071066:Patient Reported Outcome Measures; D011446:Prospective Studies; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D016896:Treatment Outcome
keywords: Forgotten Joint Score; Hip and knee arthritis; Patient-reported outcome; Total hip arthroplasty; Total knee arthroplasty