Reply to Letter to the Editor: The Withdrawn ASR™ THA and Hip Resurfacing Systems: How Have Our Patients Fared Over 1 to 6 Years?
We thank Drs. Amstutz and Le Duff for their thoughtful letter regarding our study . Specifically, they take issue with our Discussion section and the statement regarding the performance of metal-on-metal (MOM) devices as a class. I suspect they would agree that when taken as a class and grouped together as MOM devices they do not perform as favorably as the metal-on-polymer devices in the registry data. Their point is well taken that it likely is not fair to group all of the MOM devices in this fashion as the different devices have varied results reported in the literature. Some devices have fared better and functioned well in many patients. However, we believe the articular surface replacement (ASR™) device is not the only one with failure issues and therefore this class of devices needs further scrutiny and followup. The unanticipated mechanisms of failure in metal devices related to unintended edge loading and corrosion are real and the class of devices needs to be monitored....
- Hug KT, Watters TS, Vail TP, Bolognesi MP. The withdrawn ASR™ THA and hip resurfacing systems: how have our patients fared over 1 to 6 years? Clin Orthop Relat Res. 2012 Aug 28. [Epub ahead of print]
- Smith AJ, Dieppe P, Vernon K, Porter M, Blom AW; National Joint Registry of England and Wales. Failure rates of stemmed metal-on-metal hip replacements: analysis of data from the National Joint Registry of England and Wales. Lancet. 2012;379:1199–1204. CrossRef
- Smith AJ, Dieppe P, Howard PW, Blom AW; on behalf of the National Joint Registry for England and Wales. Failure rates of metal-on-metal hip resurfacings: analysis of data from the National Joint Registry for England and Wales. Lancet. 2012 Oct 1; S0140-6736(12)60989-1. doi: 10.1016/S0140-6736(12)60989-1. [Epub ahead of print]
- Reply to Letter to the Editor: The Withdrawn ASR™ THA and Hip Resurfacing Systems: How Have Our Patients Fared Over 1 to 6 Years?
Clinical Orthopaedics and Related Research®
Volume 471, Issue 1 , p 337
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- 1. Department of Orthopaedic Surgery, Duke University Medical Center, Box 3269, Durham, NC, 27710, USA
- 2. Department of Orthopaedic Surgery, University of California, San Francisco, San Francisco, CA, USA