title: Pooled outcome of total hip arthroplasty with the CementLess Spotorno (CLS) system: a comparative analysis of clinical studies and worldwide arthroplasty register data.
abstract: OBJECTIVE
  Our aim was to elucidate the pooled outcome of the CementLess Spotorno (CLS) system in total hip arthroplasty (THA).
  
  
  METHODS
  We compared the outcome of clinical inventor studies, independent clinical studies, and worldwide register data. The main endpoints for analysis were revision rates.
  
  
  RESULTS
  Twenty clinical studies were evaluated and, with one exception, overall found revision rates largely in line with register data. Revision rates (revisions per 100 observed component years) range from 0.15 (inventor study) to 0.28 (independent studies) and 0.43 (register datasets).
  
  
  CONCLUSIONS
  Data of journal publications and register datasets using the CLS system do not differ significantly with respect to revision rates. Only the initial inventor study reports a revision rate three times lower than in pooled worldwide register datasets.
authors.affiliation: Department of Orthopaedic Surgery, Medical University of Graz, Auenbruggerplatz 5, 8036, Graz, Austria. patrick.sadoghi@klinikum-graz.at
authors.forename: Patrick
authors.initials: P
authors.lastname: Sadoghi
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Janda
authors.forename: Mark
authors.initials: M
authors.lastname: Agreiter
authors.forename: Rauend
authors.initials: R
authors.lastname: Rauf
authors.forename: Andreas
authors.initials: A
authors.lastname: Leithner
authors.forename: Gerold
authors.initials: G
authors.lastname: Labek
mesh_terms: D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects / Q000295:instrumentation*; D005500:Follow-Up Studies; D006622:Hip Prosthesis / Q000009:adverse effects; D006801:Humans; D015994:Incidence; D011475:Prosthesis Failure; D012042:Registries; D012086:Reoperation / Q000706:statistics & numerical data; D012189:Retrospective Studies; D016896:Treatment Outcome