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Case Reports   |    
Corrosion-Induced Fracture of a Double-Modular Hip ProsthesisA Case Report
Sara A. Atwood, MS1; Eli W. Patten, MS1; Kevin J. Bozic, MD2; Lisa A. Pruitt, PhD1; Michael D. Ries, MD2
1 Department of Mechanical Engineering, University of California at Berkeley, 2121 Etcheverry Hall, Berkeley, CA 94720-1740. E-mail address for S.A. Atwood: saatwood@me.berkeley.edu
2 Department of Orthopaedic Surgery, University of California at San Francisco, 500 Parnassus, MU 320W, San Francisco, CA 94143-0728
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Disclosure: In support of their research for or preparation of this work, one or more of the authors received, in any one year, outside funding or grants in excess of $10,000 from the National Science Foundation (CMS 0505272). Neither they nor a member of their immediate families received payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity.

Investigation performed at the University of California at Berkeley, Berkeley, California

Copyright ©2010 American Society for Journal of Bone and Joint Surgery, Inc.
J Bone Joint Surg Am, 2010 Jun 01;92(6):1522-1525. doi: 10.2106/JBJS.I.00980
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Extract

Modularity is an important aspect of total hip replacement design. A modular Morse taper is commonly used to attach the femoral head to the femoral stem. Newer double-modular designs incorporate a second interface at the neck-stem junction. Increased modularity purportedly allows the surgeon to more closely restore patient anatomy, such as limb length, lateral offset, and femoral anteversion, and to better balance the soft tissue to achieve optimal biomechanics. However, modularity also increases the number of mechanical junctions that may lead to fretting (micromotion)1, corrosion2,3, and ultimately fracture.
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    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.
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