Early failure mechanisms of constrained tripolar acetabular sockets used in revision total hip arthroplasty

Christopher C. Cooke, William Hozack, Carlos Lavernia, Peter Sharkey, Shani Shastri, Richard H. Rothman

Research output: Contribution to journalArticle

49 Scopus citations


Fifty-eight patients received an Osteonics constrained acetabular implant for recurrent instability (46), girdlestone reimplant (8), correction of leg lengthening (3), and periprosthetic fracture (1). The constrained liner was inserted into a cementless shell (49), cemented into a pre-existing cementless shell (6), cemented into a cage (2), and cemented directly into the acetabular bone (1). Eight patients (13.8%) required reoperation for failure of the constrained implant. Type I failure (bone-prosthesis interface) occurred in 3 cases. Two cementless shells became loose, and in 1 patient, the constrained liner was cemented into an acetabular cage, which then failed by pivoting laterally about the superior fixation screws. Type II failure (liner locking mechanism) occurred in 2 cases. Type III failure (femoral head locking mechanism) occurred in 3 patients. Seven of the 8 failures occurred in patients with recurrent instability. Constrained liners are an effective method for treatment during revision total hip arthroplasty but should be used in select cases only.

Original languageEnglish (US)
Pages (from-to)827-833
Number of pages7
JournalJournal of Arthroplasty
Issue number7
Publication statusPublished - Oct 2003



  • Complications
  • Constrained sockets
  • Dislocation

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Surgery

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