title: Changing incidence of primary total hip arthroplasty and total knee arthroplasty for primary osteoarthritis.
abstract: This study reports on the incidence of primary total hip arthroplasty (THA) and total knee arthroplasty (TKA) for primary osteoarthritis in Australia. Age-specific and gender-specific numbers for Australia, 1994 through 1998, and South Australia, 1988 through 1998, were obtained. Incidences were calculated per 100,000 population. In Australia, primary THA increased from 50.9/10(5) (1994) to 60.9/10(5) (1998). TKA increased from 56.4/10(5) to 76.8/10(5). Stratified by age and gender, changes in incidence for South Australia with respect to time were tested using regression analysis. South Australia showed a significant increase in the overall incidence of THA (P=.012) and TKA (P<.001), although this was not uniform across all age groups. No significant gender differences were found. The incidence of THA is increasing, and the incidence of TKA is increasing at a greater rate.
authors.affiliation: Department of Orthopaedic Surgery, Flinders University, Flinders Medical Centre and Repatriation General Hospital, South Australia.
authors.forename: V M
authors.initials: VM
authors.lastname: Wells
authors.forename: T C
authors.initials: TC
authors.lastname: Hearn
authors.forename: K A
authors.initials: KA
authors.lastname: McCaul
authors.forename: S M
authors.initials: SM
authors.lastname: Anderton
authors.forename: A E R
authors.initials: AE
authors.lastname: Wigg
authors.forename: S E
authors.initials: SE
authors.lastname: Graves
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000706:statistics & numerical data*; D019645:Arthroplasty, Replacement, Knee / Q000706:statistics & numerical data*; D001315:Australia; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000601:surgery*; D020370:Osteoarthritis, Knee / Q000601:surgery*; D016012:Poisson Distribution; D012044:Regression Analysis