• J Arthroplasty · Feb 2014

    Wear analysis of 39 conserve plus metal-on-metal hip resurfacing retrievals.

    • Karren M Takamura, Harlan C Amstutz, Zhen Lu, Pat A Campbell, and Edward Ebramzadeh.
    • Joint Replacement Institute at St. Vincent Medical Center, Los Angeles, California.
    • J Arthroplasty. 2014 Feb 1;29(2):410-5.

    AbstractThere have been increasing concerns regarding adverse local tissue reactions (ALTR) following metal-on-metal (MOM) hip arthroplasties. This study examined wear rates in retrievals of one design of MOM resurfacing arthroplasty, and assessed the differences in wear between those with and without ALTR. Wear measurements were made on 39 MOM resurfacing components (30 femoral, 9 acetabular) which were at least 2years in vivo. Seven hips (6 patients; 4 acetabular components, 7 femoral components) were identified to have ALTR. Acetabular component abduction and anteversion angles were determined using EBRA, and the contact-patch-to-rim (CPR) distance was calculated. The ALTR group had higher linear femoral and acetabular wear rates, acetabular anteversion and abduction angles, lower CPR, and longer time to revision. Given the increased risk for ALTR associated with acetabular component malpositioning, patients with malpositioned acetabular components may require closer clinical follow-up and monitoring.Copyright © 2014 Elsevier Inc. All rights reserved.

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