title: Comparative responsiveness of measures of pain and function after total hip replacement.
abstract: OBJECTIVE
  To compare the responsiveness of the Functional Assessment System (FAS), the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC), and the Medical Outcomes Study 36-item Short Form (SF-36) in patients with osteoarthritis (OA) scheduled for total hip replacement.
  
  
  METHODS
  Twenty patients with a mean age at surgery of 72.6 years, with primary OA of the hip, were investigated preoperatively and at 3, 6, and 12 months postoperatively with the FAS, WOMAC, and SF-36. The responsiveness was calculated as standardized response mean, effect size, and relative efficiency.
  
  
  RESULTS
  The pain and function scores of WOMAC and SF-36 showed greater responsiveness than FAS at 3 months. These differences remained at 6 and 12 months postoperatively. The differences between these 3 outcome measures were found to be similar using several methods for calculating responsiveness.
  
  
  CONCLUSIONS
  Self-administered questionnaires like WOMAC and SF-36 are more responsive measures of pain and function than range of motion, performance tests, and observer-administered questions (FAS) following total hip replacement.
authors.affiliation: Department of Orthopedics, Halmstad County Hospital, Sweden.
authors.forename: A K
authors.initials: AK
authors.lastname: Nilsdotter
authors.forename: E M
authors.initials: EM
authors.lastname: Roos
authors.forename: J P
authors.initials: JP
authors.lastname: Westerlund
authors.forename: H P
authors.initials: HP
authors.lastname: Roos
authors.forename: L S
authors.initials: LS
authors.lastname: Lohmander
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip; D005260:Female; D006615:Hip / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D010146:Pain; D011183:Postoperative Complications