Fatigue Failure of the GAP Ring

Gavan P. Duffy, Mary I. O'Connor, Mark P. Brodersen

Research output: Contribution to journalArticle

12 Scopus citations


This study reports the results and early failures using the Graft Augmentation Prosthesis ring in the reconstruction of acetabular defects encountered during total hip arthroplasty. Seventeen consecutive Graft Augmentation Prosthesis rings were used during 7 complex primary and 10 revision hip arthroplasties. Five patients died during the follow-up period. Of the remaining 12 patients, 7 had been revised at an average of 5 years follow-up. Five cases were revised because of fatigue failure of the implant associated with allograft resorption. Two cases were revised for recurrent dislocations. Because of this high mechanical failure rate (5 of 12 cases at only 5 years follow-up), we have abandoned this device in favor of implants with more mechanical strength.

Original languageEnglish (US)
Pages (from-to)711-714
Number of pages4
JournalJournal of Arthroplasty
Issue number5
StatePublished - Aug 1 2007


  • GAP ring
  • acetabular defects
  • complications
  • mechanical failure
  • revision total hip arthroplasty

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

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    Duffy, G. P., O'Connor, M. I., & Brodersen, M. P. (2007). Fatigue Failure of the GAP Ring. Journal of Arthroplasty, 22(5), 711-714. https://doi.org/10.1016/j.arth.2006.12.108