title: 10-year results of the uncemented Allofit press-fit cup in young patients.
abstract: OBJECTIVE
  Uncemented acetabular components in primary total hip arthroplasty (THA) are commonly used today, but few studies have evaluated their survival into the second decade in young and active patients. We report on a minimum 10-year follow-up of an uncemented press-fit acetabular component that is still in clinical use.
  
  
  METHODS
  We examined the clinical and radiographic results of our first 121 consecutive cementless THAs using a cementless, grit-blasted, non-porous, titanium alloy press-fit cup (Allofit; Zimmer Inc., Warsaw, IN) without additional screw fixation in 116 patients. Mean age at surgery was 51 (21-60) years. Mean time of follow-up evaluation was 11 (10-12) years.
  
  
  RESULTS
  At final follow-up, 8 patients had died (8 hips), and 1 patient (1 hip) was lost to follow-up. 3 hips in 3 patients had undergone acetabular revision, 2 for deep infection and 1 for aseptic acetabular loosening. There were no impending revisions at the most recent follow-up. We did not detect periacetabular osteolysis or loosening on plain radiographs in those hips that were evaluated radiographically (n = 90; 83% of the hips available at a minimum of 10 years). Kaplan-Meier survival analysis using revision of the acetabular component for any reason (including isolated inlay revisions) as endpoint estimated the 11-year survival rate at 98% (95% CI: 92-99).
  
  
  CONCLUSIONS
  Uncemented acetabular fixation using the Allofit press-fit cup without additional screws was excellent into early in the second decade in this young and active patient cohort. The rate of complications related to the liner and to osteolysis was low.
authors.affiliation: Department of Orthopaedic and Trauma Surgery.
authors.forename: Marcus R
authors.initials: MR
authors.lastname: Streit
authors.forename: Stefan
authors.initials: S
authors.lastname: Weiss
authors.forename: Franziska
authors.initials: F
authors.lastname: Andreas
authors.forename: Thomas
authors.initials: T
authors.lastname: Bruckner
authors.forename: Tilman
authors.initials: T
authors.lastname: Walker
authors.forename: J Philippe
authors.initials: JP
authors.lastname: Kretzer
authors.forename: Volker
authors.initials: V
authors.lastname: Ewerbeck
authors.forename: Christian
authors.initials: C
authors.lastname: Merle
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging / Q000601:surgery*; D000328:Adult; D017677:Age Distribution; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000379:methods / Q000401:mortality*; D001843:Bone Cements; D005260:Female; D005500:Follow-Up Studies; D006621:Hip Joint / Q000000981:diagnostic imaging / Q000601:surgery; D006622:Hip Prosthesis / Q000706:statistics & numerical data*; D006801:Humans; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D010014:Osteolysis / Q000401:mortality; D011474:Prosthesis Design / Q000401:mortality*; D011475:Prosthesis Failure; D017755:Prosthesis Fitting / Q000379:methods / Q000401:mortality*; D011859:Radiography; D012086:Reoperation / Q000401:mortality; D055815:Young Adult
chemical_list: D001843:Bone Cements