Scientific Exhibits   |    
Polyethylene Wear Performance of Oxidized Zirconium and Cobalt-Chromium Knee Components Under Abrasive Conditions
Michael D. Ries, MD; Abraham Salehi, PhD; Kirstin Widding, MS; Gordon Hunter, PhD
J Bone Joint Surg Am, 2002 Nov 01;84(suppl 2):S129-S135
5 Recommendations (Recommend) | 3 Comments | Saved by 3 Users Save Case


The surfaces of retrieved cobalt-chromium (CoCr) total knee arthroplasty femoral components show evidence of roughening ( Fig. 1 ) 1-3 . In vitro studies have shown that scratches on the hard counterface, particularly those at an angle to the direction of motion, can increase wear of ultra-high molecular weight polyethylene 4-10 . An alternative material, oxidized zirconium (OxZr), was developed to provide an improvement over CoCr in resistance to roughening, frictional behavior, and biocompatibility 11-16 . Previous knee simulator testing under clean conditions (without intentional addition of abrasives) demonstrated that articulation with OxZr femoral components resulted in rates of wear of the ultra-high molecular weight polyethylene that were more than sixfold lower than those obtained with CoCr femoral components 17 . Because femoral components roughen clinically in a way that can increase wear of the ultra-high molecular weight polyethylene insert, simulator testing under abrasive conditions also was needed to better characterize the performance of the femoral component material. Previously, adding abrasives into the test media during simulation did not produce relevant conditions, so a technique was developed to roughen the surface of the femoral components by tumbling them with alumina powder and plastic cones before simulator testing 18 . In the present study, we compared the wear performance of CoCr and OxZr in an anatomic knee simulator under these abrasive conditions.
Figures in this Article

    First Page Preview

    View Large
    First page PDF preview
    Sign In to Your Personal ProfileSign In To Access Full Content
    Not a Subscriber?
    Get online access for 30 days for $35
    New to JBJS?
    Sign up for a full subscription to both the print and online editions
    Register for a FREE limited account to get full access to all CME activities, to comment on public articles, or to sign up for alerts.
    Register for a FREE limited account to get full access to all CME activities
    Have a subscription to the print edition?
    Current subscribers to The Journal of Bone & Joint Surgery in either the print or quarterly DVD formats receive free online access to JBJS.org.
    Forgot your password?
    Enter your username and email address. We'll send you a reminder to the email address on record.

    Forgot your username or need assistance? Please contact customer service at subs@jbjs.org. If your access is provided
    by your institution, please contact you librarian or administrator for username and password information. Institutional
    administrators, to reset your institution's master username or password, please contact subs@jbjs.org


    Accreditation Statement
    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
    CME Activities Associated with This Article
    Submit a Comment
    Please read the other comments before you post yours. Contributors must reveal any conflict of interest.
    Comments are moderated and will appear on the site at the discretion of JBJS editorial staff.

    * = Required Field
    (if multiple authors, separate names by comma)
    Example: John Doe

    Related Content
    The Journal of Bone & Joint Surgery
    JBJS Case Connector
    Topic Collections
    Related Audio and Videos
    Clinical Trials
    Readers of This Also Read...
    JBJS Jobs
    Ohio - OhioHealth Research and Innovation Institute (OHRI)
    Oregon - The Center - Orthopedic and Neurosurgical Care and Research