title: Relationship between total hip replacement appropriateness and surgical priority instruments.
abstract: BACKGROUND
  Variability in indications for total hip replacement (THR) and unequal waiting times may limit health care access.
  
  
  OBJECTIVE
  To analyse the relationship between appropriateness and previously developed surgical priority instruments.
  
  
  METHODS
  Multicentre cross-validation study of patients placed on the waiting list for THR. Information on surgical priority, surgeons' evaluation of priority through a visual analogue scale (VAS) and health-related quality of life (HRQOL) (Health Utilities Index mark 3, EQ-5D, Western Ontario McMaster Osteoarthritic Index) was collected. THR indications were considered appropriate, uncertain or inappropriate according to appropriateness criteria. Statistical differences and clinically important differences in surgical priority, VAS and HRQOL between appropriateness categories were analysed with the Mann-Whitney U-test and effect size (ES), respectively. Surgical priority score's ability to discriminate appropriate and inappropriate indications was evaluated through the area under the receiver-operating characteristic curve (AUC) and its 95% confidence interval (95% CI).
  
  
  RESULTS
  49.4% (87) of the THR indications were deemed appropriate, 39.8% (70) uncertain and 10.8% (19) inappropriate. Differences in surgical priority score, VAS and HRQOL between appropriateness categories were statistically significant. Clinically important differences were generally small (ES, 0.2-0.5) between inappropriate and uncertain, moderate (ES, 0.5-0.8) between uncertain and appropriate, and large (ES > 0.8) between inappropriate and appropriate categories. The AUC to discriminate appropriate and inappropriate indications was 0.97 (95% CI: 0.96-0.99) and 0.90 (95% CI: 0.83-0.97), respectively.
  
  
  CONCLUSIONS
  The relationship between the surgical priority and appropriateness instruments reinforces their validity and could improve waiting list management by establishing maximum waiting periods based on patients' characteristics.
authors.affiliation: Catalan Agency for Health Technology Assessment and Research - CIBER Epidemiología y Salud Pública (CIBERESP), Spain. aallepuz@ambitcp.catsalut.net
authors.forename: Alejandro
authors.initials: A
authors.lastname: Allepuz
authors.forename: José M
authors.initials: JM
authors.lastname: Quintana
authors.forename: Mireia
authors.initials: M
authors.lastname: Espallargues
authors.forename: Antonio
authors.initials: A
authors.lastname: Escobar
authors.forename: Montse
authors.initials: M
authors.lastname: Moharra
authors.forename: Inmaculada
authors.initials: I
authors.lastname: Arostegui
mesh_terms: D000368:Aged; D019540:Area Under Curve; D019644:Arthroplasty, Replacement, Hip; D016001:Confidence Intervals; D005260:Female; D006304:Health Status; D006801:Humans; D008297:Male; D008875:Middle Aged; D009313:National Health Programs; D020380:Needs Assessment / Q000706:statistics & numerical data; D011788:Quality of Life; D013030:Spain; D011795:Surveys and Questionnaires / Q000592:standards; D014850:Waiting Lists