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Complete Dissociation of the Polyethylene Component in a Newly Available Dual-Mobility Bearing Used in Total Hip ArthroplastyA Case Report
Joseph P. Ward, MD1; Brian R. McCardel, MD2; Brian R. Hallstrom, MD1
1 Department of Orthopaedic Surgery, University of Michigan, 1500 East Medical Center Drive, TC2912, Ann Arbor, MI 48109-5328. E-mail address for J.P. Ward: josward@med.umich.edu
2 East Lansing Orthopedic Association, P.C., 3394 East Jolly Road, Suite A, Lansing, MI 48910
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Investigation performed at the Department of Orthopaedic Surgery, University of Michigan, Ann Arbor, Michigan

Disclosure: None of the authors received payments or services, either directly or indirectly (i.e., via his or her institution), from a third party in support of any aspect of this work. None of the authors, or their institution(s), have had any financial relationship, in the thirty-six months prior to submission of this work, with any entity in the biomedical arena that could be perceived to influence or have the potential to influence what is written in this work. Also, no author has had any other relationships, or has engaged in any other activities, that could be perceived to influence or have the potential to influence what is written in this work. The complete Disclosures of Potential Conflicts of Interest submitted by authors are always provided with the online version of the article.

Copyright © 2013 by The Journal of Bone and Joint Surgery, Inc.
JBJS Case Connector, 2013 Sep 25;3(3):e94 1-4. doi: 10.2106/JBJS.CC.L.00213
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Bousquet developed the concept of the dual-mobility bearing in total hip arthroplasty1,2. The design allows for two articulations between the femoral head and the acetabular component. The polyethylene component widens the effective diameter of the femoral head with the goal of increasing stability2. In the literature, there have been reports that dual-mobility bearings used in patients undergoing primary total hip arthroplasty lead to decreased dislocation rates1,3-6. Some have also described the use of dual-mobility bearings in revision total hip arthroplasty for patients experiencing recurrent dislocation7-9.
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    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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