Abstract
Unlike traditional bipolar constrained liners, the Osteonics Omnifit constrained acetabular insert is a tripolar device, consisting of an inner bipolar bearing articulating within an outer, true liner. Every reported failure of the Omnifit tripolar implant has been by failure at the shell-bone interface (Type I failure), failure at the shell-liner interface (Type II failure), or failure of the locking mechanism resulting in dislocation of the bipolar-liner interface (Type III failure). In this report we present two cases of failure of the Omnifit tripolar at the bipolar-femoral head interface. To our knowledge, these are the first reported cases of failure at the bipolar-femoral head interface (Type IV failure). In addition, we described the first successful closed reduction of a Type IV failure.
Original language | English (US) |
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Pages (from-to) | 322.e5-322.e11 |
Journal | Journal of Arthroplasty |
Volume | 24 |
Issue number | 2 |
DOIs | |
State | Published - Feb 2009 |
Keywords
- constrained liner
- dislocation
- failure
- hip arthroplasty
ASJC Scopus subject areas
- Orthopedics and Sports Medicine