Failure of constrained acetabular liner without metal ring ... | 合法醫療器材資訊網

由SSSathappan著作·2008·被引用9次—WereportapatientwhopresentedwithdissociationofthecementedOsteonicsacetabularconstrainedliner(Stryker-Howmedica-Osteonics,Rutherford,New ...

Constrained acetabular liners can fail leading to recurrent dislocation. Failure can occur at any of the five possible interfaces: bone-acetabular shell, acetabular shell-constrained liner insert, constrained liner insert-bipolar head, bipolar head- femoral head and femoral head-trunion. We report a patient who presented with dissociation of the cemented Osteonics acetabular constrained liner (Stryker-Howmedica-Osteonics, Rutherford, New Jersey). The failure interface was at the factory pre-assembled constrained liner insert-bipolar head without any locking ring failure; instead there was deformation of the constrained liner inserts polyethylene rim, which facilitated dissociation. To our knowledge, there are no previous reports of such a failure mode pertaining to this type of constrained liner. Constrained acetabular liners are indicated during primary or revision total hip arthroplasty for patients who are at hig...