title: Not all cementless femoral stems are created equal but the results may be comparable.
abstract: OBJECTIVE
  The aim of this study was to compare the survivorship and radiographic outcomes at ten-year follow-up of three prospective consecutive series of patients each of which received a different design of cementless femoral components for total hip arthroplasty (THA).
  
  
  METHODS
  In Cohort 1, 91 consecutive patients (100 hips) underwent THA with a cementless porous-coated anatomic femoral stem (PCA) between October 1983 and January 1986. In Cohort 2, 86 consecutive patients (100 hips) underwent THA with an extensively porous-coated cementless femoral stem (Prodigy) between June 1994 and October 1997. In Cohort 3, 88 consecutive patients (100 hips) underwent THA with a proximally porous-coated triple-tapered cementless stem (Summit) between April 2002 and October 2003. All three groups underwent prospective clinical and radiographic evaluation.
  
  
  RESULTS
  Kaplan-Meier survivorship analysis of Cohort 1 was 91% (95% confidence interval (CI) 88 to 94) with an endpoint of revision for any reason and 97% (95% CI 95 to 99) with aseptic loosening as the endpoint. Survivorship of Cohort 2 was 88% (95% CI 79 to 97) for revision for any reason and 100% for aseptic loosening. Survivorship of Cohort 3 was 95% (95% CI 91 to 99) for revision for any reason and 100% with aseptic loosening as the endpoint.
  
  
  CONCLUSIONS
  With revision for aseptic loosening of the femoral component as the endpoint, the three femoral components with different design philosophies demonstrated excellent survivorship, ranging from 97% to 100% at ten years. Cite this article: Bone Joint J 2017;99-B(1 Supple A):14-17.
authors.affiliation: University of Iowa, University of Iowa College of Medicine, 01073 JPP, 200 Hawkins Drive, Iowa City, IA 52242, USA.
authors.forename: S W
authors.initials: SW
authors.lastname: Carlson
authors.affiliation: University of Iowa, University of Iowa College of Medicine, 01073 JPP, 200 Hawkins Drive, Iowa City, IA 52242, USA.
authors.forename: S S
authors.initials: SS
authors.lastname: Liu
authors.affiliation: University of Iowa, University of Iowa College of Medicine, 01073 JPP, 200 Hawkins Drive, Iowa City, IA 52242, USA.
authors.forename: J J
authors.initials: JJ
authors.lastname: Callaghan
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation* / Q000379:methods; D001843:Bone Cements; D002484:Cementation; D015331:Cohort Studies; D005260:Female; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D016062:Porosity; D011446:Prospective Studies; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012086:Reoperation / Q000706:statistics & numerical data; D013499:Surface Properties; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D001843:Bone Cements
keywords: Cementless total hip arthroplasty; Primary total hip arthroplasty; Prosthesis design