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J Arthroplasty. 2011 Sep;26(6 Suppl):14-8. doi: 10.1016/j.arth.2011.03.027. Epub 2011 May 8.

Early failure of articular surface replacement XL total hip arthroplasty.

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  • 1OrthoCarolina, PA, Charlotte, North Carolina 28207, USA.

Abstract

The ASR (articular surface replacement) XL (DePuy, Warsaw, Ind) metal-on-metal hip arthroplasty offers the advantage of stability and increased motion. However, an alarming number of early failures prompted the evaluation of patients treated with this system. A prospective study of patients who underwent arthroplasty with the ASR XL system was performed. Patients with 2-year follow-up or any revision were included. Failure rates, Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) scores, and radiographs were evaluated. Ninety-five patients (105 hips) were included. There were 16 revisions. Thirteen (12%) were aseptic acetabular failures. Eight were revised for aseptic loosening; 4, for metallosis; 1, for malposition; 2, for infection; and 1, for periprosthetic fracture. Mean time to revision was 1.6 years (0.18-3.4 years). The ASR XL with a revision rate of 12% is the second reported 1 piece metal-on-metal system with a significant failure rate at early follow-up. This particular class of implants has inherent design flaws that lead to early failure.

Copyright © 2011. Published by Elsevier Inc. All rights reserved.

PMID:
21550764
[PubMed - indexed for MEDLINE]
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