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The Journal of Bone and Joint Surgery 80:561-5 (1998)
© 1998 The Journal of Bone and Joint Surgery, Inc.

Failure of a Constrained Acetabular Prosthesis of a Total Hip Arthroplasty. A Report of Four Cases*

BERTRAND P. KAPER, M.D.{dagger} and PHILIP M. BERNINI, M.D.{dagger}, LEBANON, NEW HAMPSHIRE

Investigation performed at the Section of Orthopaedic Surgery, Department of Surgery, Dartmouth-Hitchcock Medical Center, Lebanon


   Introduction
 
Instability with recurrent dislocation after total hip arthroplasty is a formidable challenge to the orthopaedic surgeon. The prevalence of dislocation has been reported to be 1 to 8 per cent in series ranging from 300 to 10,500 total hip arthroplasties4-6,10,16. Relative risk factors for dislocation include a previous operation on the hip, the type of operative approach used, the selection and orientation of the components, the method of postoperative management, an altered neuromuscular status, and lack of patient cooperation3-6,9,10,12,16. The use of a constrained acetabular polyethylene liner provides the orthopaedic surgeon with another option with which to address the problem of instability.

We have managed four patients who had failure of a revision total hip arthroplasty involving an S-ROM constrained acetabular polyethylene liner (Joint Medical Products, Stamford, Connecticut) (Figs. 1-A and 1-B). Two of the failures were associated with a fracture of the constraining ring on . . . [Full Text of this Article]


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