title: Hip resurfacing arthroplasty: short-term survivorship of 4,401 hips from the Finnish Arthroplasty Register.
abstract: OBJECTIVE
  Population-based registry data from the Nordic Arthroplasty Register Association (NARA) and from the National Joint Register of England and Wales have revealed that the outcome after hip resurfacing arthroplasty (HRA) is inferior to that of conventional total hip arthroplasty (THA). We analyzed the short-term survival of 4,401 HRAs in the Finnish Arthroplasty Register.
  
  
  METHODS
  We compared the revision risk of the 4,401 HRAs from the Register to that of 48,409 THAs performed during the same time period. The median follow-up time was 3.5 (0-9) years for HRAs and 3.9 (0-9) years for THAs.
  
  
  RESULTS
  There was no statistically significant difference in revision risk between HRAs and THAs (RR = 0.93, 95% CI: 0.78-1.10). Female patients had about double the revision risk of male patients (RR = 2.0, CI: 1.4-2.7). Hospitals that had performed 100 or more HRA procedures had a lower revision risk than those with less than 100 HRAs (RR = 0.6, CI: 0.4-0.9). Articular Surface Replacement (ASR, DePuy) had inferior outcome with higher revision risk than the Birmingham Hip Resurfacing implant (BHR, Smith & Nephew), the reference implant (RR = 1.8, CI: 1.2-2.7).
  
  
  CONCLUSIONS
  We found that HRA had comparable short-term survivorship to THA at a nationwide level. Implant design had an influence on revision rates. ASR had higher revision risk. Low hospital procedure volume worsened the outcome of HRA. Female patients had twice the revision risk of male patients.
authors.affiliation: Department of Orthopaedics and Traumatology, Turku University Hospital, Turku, Finland.
authors.forename: Matti
authors.initials: M
authors.lastname: Seppänen
authors.forename: Keijo
authors.initials: K
authors.lastname: Mäkelä
authors.forename: Petri
authors.initials: P
authors.lastname: Virolainen
authors.forename: Ville
authors.initials: V
authors.lastname: Remes
authors.forename: Pekka
authors.initials: P
authors.lastname: Pulkkinen
authors.forename: Antti
authors.initials: A
authors.lastname: Eskelinen
mesh_terms: D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000592:standards / Q000706:statistics & numerical data*; D002648:Child; D005260:Female; D006276:Health Facility Size / Q000706:statistics & numerical data; D006622:Hip Prosthesis / Q000592:standards* / Q000706:statistics & numerical data; D006801:Humans; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D009664:Norway / Q000453:epidemiology; D015207:Osteoarthritis, Hip / Q000601:surgery*; D011474:Prosthesis Design / Q000706:statistics & numerical data; D011475:Prosthesis Failure; D012042:Registries; D012086:Reoperation / Q000706:statistics & numerical data; D012307:Risk Factors; D012735:Sexual Dysfunction, Physiological; D055815:Young Adult