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Poor Mid-Term Survival of the Low-Carbide Metal-on-Metal Zweymüller-Plus Total Hip Arthroplasty System

A Concise Follow-up, at a Minimum of Ten Years, of a Previous Report*

Repantis, Thomas, MD, PhD1; Vitsas, Vasilis, MD1; Korovessis, Panagiotis, MD, PhD1

doi: 10.2106/JBJS.L.00031
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Abstract: Between 1994 and 1999, 217 metal-on-metal total hip arthroplasties with a low-carbide bearing surface were performed with use of the cementless Zweymüller SL-Plus stem and the Bicon-Plus threaded cup in 194 consecutive patients. After a minimum follow-up of ten years, 181 living patients (203 hips) were available for evaluation. The revision rate after an average of twelve years was 18% (thirty-six hips in thirty-six patients were revised). The main reason for revision was aseptic loosening of one or both components. The probability of survival of the stem at fifteen years was 77% (95% confidence interval [CI], 65% to 86%). The probability of survival of the cup was 80% (95% CI, 62% to 90%). These high failure rates at mid-term follow-up led us to abandon the use of low-carbide metal-on-metal total hip arthroplasty components.

Level of Evidence: Therapeutic Level IV. See Instructions for Authors for a complete description of levels of evidence.

1Orthopaedic Department, General Hospital “Agios Andreas,” 1 Tsertidou Street, GR-26224 Patras, Greece. E-mail address for P. Korovessis: korovess@otenet.gr

Copyright © 2013 by The Journal of Bone and Joint Surgery, Incorporated
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