title: Assessing the comparability of hip arthroplasty registries in order to improve the recording and monitoring of outcome.
abstract: OBJECTIVE
  We aimed to assess the comparability of data in joint replacement registries and identify ways of improving the comparisons between registries and the overall monitoring of joint replacement surgery.
  
  
  METHODS
  We conducted a review of registries that are full members of the International Society of Arthroplasty Registries with publicly available annual reports in English. Of the six registries which were included, we compared the reporting of: mean age, definitions for revision and re-operation, reasons for revision, the approach to analysing revisions, and patient-reported outcome measures (PROMs) for primary and revision total hip arthroplasty (THA) and hip resurfacing arthroplasty (HRA).
  
  
  RESULTS
  Outcomes were infrequently reported for HRA compared with THA and all hip arthroplasties. Revisions were consistently defined, though re-operation was defined by one registry. Implant survival was most commonly reported as the cumulative incidence of revision using Kaplan-Meier survival analysis. Three registries reported patient reported outcome measures.
  
  
  CONCLUSIONS
  More consistency in the reporting of outcomes for specific types of procedures is needed to improve the interpretation of joint registry data and accurately monitor safety trends. As collecting additional details of surgical and patient-reported outcomes becomes increasingly important, the experience of established registries will be valuable in establishing consistency among registries while maintaining the quality of data.
  
  
  CONCLUSIONS
  As the volume of joint replacements performed each year continues to increase, greater consistency in the reporting of surgical and patient-reported outcomes among joint replacement registries would improve the interpretation and comparability of these data to monitor outcomes accurately.
authors.affiliation: University of Calgary, Alberta Bone and Joint Health Institute, 3280 Hospital Drive NW, Calgary, Alberta T2N 4Z6, Canada.
authors.forename: S
authors.initials: S
authors.lastname: Lacny
authors.affiliation: University of Manitoba, 301-1155 Concordia Avenue, Winnipeg, Manitoba R2K 2M9, Canada.
authors.forename: E
authors.initials: E
authors.lastname: Bohm
authors.affiliation: University of Toronto, 190 Elizabeth St., RFE, 3-805, Toronto, Ontario M5G 2C4, Canada.
authors.forename: G
authors.initials: G
authors.lastname: Hawker
authors.affiliation: University of Calgary, 0444 3134 Hospital Drive NW, Calgary, Alberta T2N 4Z6, Canada.
authors.forename: J
authors.initials: J
authors.lastname: Powell
authors.affiliation: University of Calgary, Alberta Bone and Joint Health Institute, 3280 Hospital Drive NW, Calgary, Alberta T2N 4Z6, Canada.
authors.forename: D A
authors.initials: DA
authors.lastname: Marshall
mesh_terms: D019644:Arthroplasty, Replacement, Hip / Q000706:statistics & numerical data*; D006622:Hip Prosthesis; D006801:Humans; D011474:Prosthesis Design; D012042:Registries / Q000706:statistics & numerical data*; D012086:Reoperation; D015203:Reproducibility of Results
keywords: Health Care; Treatment Outcome; Registries; Arthroplasty; Replacement; Orthopaedics; Quality Assurance