title: The Epidemiology and National Trends of Bearing Surface Usage in Primary Total Hip Arthroplasty in Korea.
abstract: BACKGROUND
  We analyzed the data for primary total hip arthroplasty (THA) in the Korean nationwide database to assess (1) the epidemiology and national trends of bearing surface usage in THAs and (2) the prevalence of each type of bearing surface according to age, gender, hospital type, primary payer, and hospital procedure volume.
  
  
  METHODS
  A total of 30,881 THAs were analyzed using the Korean Health Insurance Review and Assessment Service database for 2007 through 2011. Bearing surfaces were sub-grouped according to device code for national health insurance claims and consisted of ceramic-on-ceramic (CoC), metal-on-polyethylene (MoP), ceramic-on-polyethylene (CoP), and metal-on-metal (MoM). The prevalence of each type of bearing surface was calculated and stratified by age, gender, hospital type, primary payer, and procedure volume of each hospital.
  
  
  RESULTS
  CoC was the most frequently used bearing surface (76.7%), followed by MoP (11.9%), CoP (7.3%), and MoM (4.1%). The proportion of THAs using a CoC bearing surface increased steadily from 71.6% in 2007 to 81.4% in 2011, whereas the proportions using CoP, MoP, and MoM bearing surfaces decreased. The order of prevalence was identical to that in the general population regardless of age, gender, hospital type, primary payer, and hospital procedure volume.
  
  
  CONCLUSIONS
  The trends and epidemiology of bearing surface usage in THAs in Korea are different from those in other countries, and the CoC bearing surface is the most prevalent articulation. In future, the results of a large-scale study using nationwide data of THAs involving a CoC bearing surface will be reported in Korea.
authors.affiliation: Department of Orthopaedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
authors.forename: Pil Whan
authors.initials: PW
authors.lastname: Yoon
authors.affiliation: Department of Orthopedic Surgery, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: Jeong Joon
authors.initials: JJ
authors.lastname: Yoo
authors.affiliation: Office of Health Services Research, National Evidence-Based Healthcare Collaborating Agency, Seoul, Korea.
authors.forename: Yunjung
authors.initials: Y
authors.lastname: Kim
authors.affiliation: Office of Health Services Research, National Evidence-Based Healthcare Collaborating Agency, Seoul, Korea.
authors.forename: Seungmi
authors.initials: S
authors.lastname: Yoo
authors.affiliation: Department of Orthopedic Surgery, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: Sahnghoon
authors.initials: S
authors.lastname: Lee
authors.affiliation: Department of Orthopedic Surgery, Seoul National University College of Medicine, Seoul, Korea.; Medical Research Center, Seoul National University, Seoul, Korea.
authors.forename: Hee Joong
authors.initials: HJ
authors.lastname: Kim
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000379:methods / Q000706:statistics & numerical data* / Q000639:trends*; D002516:Ceramics / Q000627:therapeutic use; D003430:Cross-Sectional Studies; D005260:Female; D006622:Hip Prosthesis / Q000706:statistics & numerical data*; D006801:Humans; D008297:Male; D008670:Metals / Q000627:therapeutic use; D008875:Middle Aged; D020959:Polyethylene / Q000627:therapeutic use; D056910:Republic of Korea / Q000453:epidemiology
chemical_list: D008670:Metals; D020959:Polyethylene
keywords: Arthroplasty; Cross-sectional studies; Epidemiology; Hip