title: [Treatment of acetabular defects with the trabecular metal revision system].
abstract: BACKGROUND
  The results after acetabular component revision are very heterogeneous, irrespective of the use of established or new components. This could be due to a lack of treatment standards for new revision components. The Trabecular Metal™ (TM) revision system, through its modularity, allows for an individual intraoperative reconstruction of the acetabular defect with a single implant system. It was the aim of this study to investigate the results of acetabular revision with the TMT system taking into consideration the utilized components and the acetabular defect.
  
  
  METHODS
  A total of 200 consecutive isolated revisions of the acetabular component from 2010 until 2012 were retrospectively analyzed from our institutional database. Of the 200 cases, 114 revisions were performed with a combination of different TMT components (wedge and cup, cup and cage). Aseptic cup failure and revision for any reason were the defined endpoints of this study. The acetabular defects were graded according to the Paprosky classification.
  
  
  RESULTS
  The average patient age was 63.6 ± 14.8 years (range 32-85 years) and the average follow-up was 5.3 ± 0.7 years. The overall revision rate, independent of the utilized components, was 4.4% and the revision rate for aseptic failure of the acetabular component was 2.6%. The revision rate for aseptic loosening for Paprosky type I and II defects was 0% and Paprosky type III and IV defects was 12%.
  
  
  CONCLUSIONS
  The modular TMT system shows low revision rates. The modularity of the system allows for a safe and intraoperative adaptation to the individual acetabular defect without the need for extensive preoperative imaging or custom-made implants.
authors.affiliation: Centrum für Muskuloskeletale Chirurgie, Charité - Universitätsmedizin Berlin, Charitéplatz1, 10117, Berlin, Deutschland. georgi.wassilew@charite.de.
authors.forename: G I
authors.initials: GI
authors.lastname: Wassilew
authors.affiliation: Centrum für Muskuloskeletale Chirurgie, Charité - Universitätsmedizin Berlin, Charitéplatz1, 10117, Berlin, Deutschland.
authors.forename: V
authors.initials: V
authors.lastname: Janz
authors.affiliation: Centrum für Muskuloskeletale Chirurgie, Charité - Universitätsmedizin Berlin, Charitéplatz1, 10117, Berlin, Deutschland.
authors.forename: C
authors.initials: C
authors.lastname: Perka
authors.affiliation: Centrum für Muskuloskeletale Chirurgie, Charité - Universitätsmedizin Berlin, Charitéplatz1, 10117, Berlin, Deutschland.
authors.forename: M
authors.initials: M
authors.lastname: Müller
mesh_terms: D065526:Acetabuloplasty / Q000295:instrumentation* / Q000706:statistics & numerical data; D000077:Acetabulum / Q000601:surgery*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation* / Q000379:methods / Q000706:statistics & numerical data*; D019544:Equipment Failure Analysis; D005260:Female; D006622:Hip Prosthesis / Q000706:statistics & numerical data*; D006801:Humans; D008297:Male; D008670:Metals; D008875:Middle Aged; D015995:Prevalence; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012086:Reoperation / Q000295:instrumentation* / Q000706:statistics & numerical data*; D012189:Retrospective Studies; D016896:Treatment Outcome
chemical_list: D008670:Metals
keywords: Hip replacement arthroplasty; Paprosky classification; Pelvic discontinuity; Revision, surgical; Trabecular metal technology