title: Countrywise results of total hip replacement. An analysis of 438,733 hips based on the Nordic Arthroplasty Register Association database.
abstract: OBJECTIVE
  An earlier Nordic Arthroplasty Register Association (NARA) report on 280,201 total hip replacements (THRs) based on data from 1995-2006, from Sweden, Norway, and Denmark, was published in 2009. The present study assessed THR survival according to country, based on the NARA database with the Finnish data included.
  
  
  METHODS
  438,733 THRs performed during the period 1995-2011 in Sweden, Denmark, Norway, and Finland were included. Kaplan-Meier survival analysis was used to calculate survival probabilities with 95% confidence interval (CI). Cox multiple regression, with adjustment for age, sex, and diagnosis, was used to analyze implant survival with revision for any reason as endpoint.
  
  
  RESULTS
  The 15-year survival, with any revision as an endpoint, for all THRs was 86% (CI: 85.7-86.9) in Denmark, 88% (CI: 87.6-88.3) in Sweden, 87% (CI: 86.4-87.4) in Norway, and 84% (CI: 82.9-84.1) in Finland. Revision risk for all THRs was less in Sweden than in the 3 other countries during the first 5 years. However, revision risk for uncemented THR was less in Denmark than in Sweden during the sixth (HR = 0.53, CI: 0.34-0.82), seventh (HR = 0.60, CI: 0.37-0.97), and ninth (HR = 0.59, CI: 0.36-0.98) year of follow-up.
  
  
  CONCLUSIONS
  The differences in THR survival rates were considerable, with inferior results in Finland. Brand-level comparison of THRs in Nordic countries will be required.
authors.affiliation: Department of Orthopaedics and Traumatology , Turku University Hospital.
authors.forename: Keijo T
authors.initials: KT
authors.lastname: Mäkelä
authors.forename: Markus
authors.initials: M
authors.lastname: Matilainen
authors.forename: Pekka
authors.initials: P
authors.lastname: Pulkkinen
authors.forename: Anne M
authors.initials: AM
authors.lastname: Fenstad
authors.forename: Leif I
authors.initials: LI
authors.lastname: Havelin
authors.forename: Lars
authors.initials: L
authors.lastname: Engesaeter
authors.forename: Ove
authors.initials: O
authors.lastname: Furnes
authors.forename: Søren
authors.initials: S
authors.lastname: Overgaard
authors.forename: Alma B
authors.initials: AB
authors.lastname: Pedersen
authors.forename: Johan
authors.initials: J
authors.lastname: Kärrholm
authors.forename: Henrik
authors.initials: H
authors.lastname: Malchau
authors.forename: Göran
authors.initials: G
authors.lastname: Garellick
authors.forename: Jonas
authors.initials: J
authors.lastname: Ranstam
authors.forename: Antti
authors.initials: A
authors.lastname: Eskelinen
mesh_terms: D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000706:statistics & numerical data*; D003718:Denmark; D005260:Female; D005387:Finland; D006620:Hip Fractures / Q000601:surgery*; D006622:Hip Prosthesis / Q000706:statistics & numerical data*; D006801:Humans; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D009664:Norway; D015207:Osteoarthritis, Hip / Q000601:surgery*; D016016:Proportional Hazards Models; D011475:Prosthesis Failure; D012042:Registries; D012086:Reoperation / Q000706:statistics & numerical data; D013548:Sweden; D016896:Treatment Outcome