title: Survival of uncemented cups from a single manufacturer implanted from 1985 to 2013: Finnish Arthroplasty Register data.
abstract: BACKGROUND
  Total hip arthroplasty (THA) with uncemented implants has been a relatively common procedure in Finland during the recent decades. The most common brand of uncemented implants was chosen for further analysis to study the survivorship of this uncemented cup design in comparison to cemented references.
  
  
  METHODS
  Since 1980, The Finnish Arthroplasty Register has collected information on THAs on a national level. This study was based on information of THAs recorded in the Finnish Arthroplasty Register from 1985 to 2013. If patient had undergone bilateral THA, only the first one was included. Altogether, 49,289 THAs were included.
  
  
  RESULTS
  The overall 10-year implant survivorship of uncemented implants was 84.3% (95% CI 83.5-85.0%) and of cemented implants 90.6% (90.2-90.0%). The 10-year survival of the contemporary uncemented implants was 90.8% (94.0-95.5%) and 88.5% (84.2-91.7%). The most recently introduced uncemented cup designs had good survivorship rates at 5 years; 10-year survival data are not yet available.
  
  
  CONCLUSIONS
  We found that modern uncemented cup designs may provide good long-term survivorship rates comparable with the gold standard of cemented cups. However, polyethylene wear, liner problems and periosthetic osteolysis may still occur, also with modern uncemented acetabular components.
authors.affiliation: Department of Orthopaedics and Traumatology, Turku University Hospital, Turku, Finland. antton.palomaki@tyks.fi.
authors.forename: Antton
authors.identifier: http://orcid.org/0000-0002-7754-8184
authors.initials: A
authors.lastname: Palomäki
authors.affiliation: Department of Orthopaedics and Traumatology, Turku University Hospital, Turku, Finland.
authors.forename: Lasse
authors.initials: L
authors.lastname: Lempainen
authors.affiliation: Department of Biostatistics, Turku University, Turku, Finland.
authors.forename: Markus
authors.initials: M
authors.lastname: Matilainen
authors.affiliation: Coxa Hospital for Joint Replacement, Tampere, Finland.
authors.forename: Antti
authors.initials: A
authors.lastname: Eskelinen
authors.affiliation: Pihlajalinna Ltd, Helsinki, Finland.
authors.forename: Ville
authors.initials: V
authors.lastname: Remes
authors.affiliation: Department of Orthopaedics and Traumatology, Turku University Hospital, Turku, Finland.
authors.forename: Petri
authors.initials: P
authors.lastname: Virolainen
authors.affiliation: Department of Orthopaedics and Traumatology, Turku University Hospital, Turku, Finland.
authors.forename: Keijo T
authors.initials: KT
authors.lastname: Mäkelä
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D005260:Female; D005387:Finland / Q000453:epidemiology; D006622:Hip Prosthesis; D006801:Humans; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D010014:Osteolysis / Q000453:epidemiology; D020959:Polyethylene; D011183:Postoperative Complications / Q000453:epidemiology; D016016:Proportional Hazards Models; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012042:Registries; D012086:Reoperation / Q000706:statistics & numerical data; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D020959:Polyethylene
keywords: Cemented; Total hip arthroplasty; Uncemented