title: Long-term clinical results of Charnley total hip arthroplasty using a matte satin-finished stem: a 30-year average follow-up study.
abstract: BACKGROUND
  Although 50 years have passed since Charnley started performing total hip arthroplasties, there are relatively few patient studies with a follow-up period of over 30 years. We studied radiograms of patients who had undergone Charnley total hip arthroplasty between 1975 and 1981 and evaluated the results at 26-35 years (mean 30.5 years) after the operation.
  
  
  METHODS
  The operations were performed in 87 joints of 82 patients (26 males and 56 females) aged 26-81 years (mean age 56 years) at the time of surgery. A monoblock-type Charnley stem with a 22-mm head was used in all patients. The stem had a matte satin surface finish and a flange or round-back shoulder. The socket was made of ultra-high-density polyethylene without a flange. All operations were performed by one surgeon using the original Charnley method in all patients, excluding the first five.
  
  
  RESULTS
  Thirty years after the operation, 48 patients have died, 5 had an infection, 9 were lost to follow-up, and 20 patients with 24 joints are still alive. In 77 patients (82 joints), after excluding the 5 with infection, the socket and stem survival rates were 54 and 75% at 30 years after the operation when radiographic loosening or revision surgery was defined as the end point. With revision surgery as the end point, the rates were 68 and 82%, respectively.
  
  
  CONCLUSIONS
  These results were as favorable as those with surgical techniques (including the first-generation cement technique) and implants in the early period. Although new techniques and implants have since been introduced, their long-term results should exceed those in this study. The results of this study should provide a valuable index with which to compare the long-term studies of current total hip arthroplasty.
authors.affiliation: Department of Orthopaedic Surgery, Toyooka Chuo Hospital, 7-2 Toyooka, Asahikawa, 078-8237, Japan, egoto@potato.hokkai.net.
authors.forename: Eiji
authors.initials: E
authors.lastname: Goto
authors.forename: Tadashi
authors.initials: T
authors.lastname: Teranishi
authors.forename: Muneharu
authors.initials: M
authors.lastname: Tsuji
authors.forename: Mifumi
authors.initials: M
authors.lastname: Ando
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D005260:Female; D005500:Follow-Up Studies; D005544:Forecasting; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000000981:diagnostic imaging / Q000601:surgery*; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography; D012086:Reoperation