title: Population requirement for primary knee replacement surgery: a cross-sectional study.
abstract: OBJECTIVE
  To determine the population requirement for total knee replacement (TKR) in England.
  
  
  METHODS
  Population-based study using an age/sex-stratified random sample of 28 080 individuals aged 35 yr and over. Incident disease was estimated from prevalence by statistical modelling. The New Zealand priority criteria for major joint replacement were used for case selection.
  
  
  RESULTS
  Patients with knee disease were less likely than those with equally severe hip disease to have been referred to a specialist, to have consulted an orthopaedic surgeon or to be on a waiting list for joint replacement. The estimated annual requirement of TKRs in England, based on New Zealand Scores alone, was 55,800 (95% CI 40 700-70,900), contrasting sharply with an annual provision of 29,300 actually observed. However, in contrast to previously reported hip replacement data, when patient willingness to undergo surgery was considered, this estimate decreased considerably.
  
  
  CONCLUSIONS
  There appears to be an underprovision of TKR in England. This may be due in part to differences in perception of disease severity and likely response to surgery between patients and general practitioners on one hand, and rheumatologists and orthopaedic surgeons on the other.
authors.affiliation: Department of Rheumatology, University of Berne, 3010 Berne, Switzerland. peter.juni@bristol.ac.uk
authors.forename: P
authors.initials: P
authors.lastname: Jüni
authors.forename: P
authors.initials: P
authors.lastname: Dieppe
authors.forename: J
authors.initials: J
authors.lastname: Donovan
authors.forename: T
authors.initials: T
authors.lastname: Peters
authors.forename: J
authors.initials: J
authors.lastname: Eachus
authors.forename: N
authors.initials: N
authors.lastname: Pearson
authors.forename: R
authors.initials: R
authors.lastname: Greenwood
authors.forename: S
authors.initials: S
authors.lastname: Frankel
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000706:statistics & numerical data*; D003430:Cross-Sectional Studies; D004739:England / Q000453:epidemiology; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D020380:Needs Assessment; D016017:Odds Ratio; D020370:Osteoarthritis, Knee / Q000453:epidemiology / Q000601:surgery; D015995:Prevalence; D017678:Sex Distribution