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Selected Instructional Course Lecture   |    
Instability After Total Knee Arthroplasty
Sebastien Parratte, MD1; Mark W. Pagnano, MD2
1 Department of Orthopaedic Surgery, Aix–Marseille University, Hospital Sainte-Marguerite, 270 Boulevard Sainte-Marguerite, 13009, Marseille, France
2 Department of Orthopedic Surgery, Mayo Clinic, 200 First Street S.W., Rochester, MN 55905. E-mail address: pagnano.mark@mayo.edu
View Disclosures and Other Information
Printed with permission of the American Academy of Orthopaedic Surgeons. This article, as well as other lectures presented at the Academy's Annual Meeting, will be available in March 2008 in Instructional Course Lectures, Volume 57. The complete volume can be ordered online at www.aaos.org, or by calling 800-626-6726 (8 a.m.-5 p.m., Central time).
Disclosure: The authors did not receive any outside funding or grants in support of their research for or preparation of this work. 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. Commercial entities (DePuy, Stryker, and Zimmer) paid or directed in any one year, or agreed to pay or direct, benefits of less than $10,000 to a research fund, foundation, division, center, clinical practice, or other charitable or nonprofit organization with which one or more of the authors, or a member of his or her immediate family, is affiliated or associated.
An Instructional Course Lecture, American Academy of Orthopaedic Surgeons

The Journal of Bone and Joint Surgery, Inc.
J Bone Joint Surg Am, 2008 Jan 01;90(1):184-194
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Look for this and other related articles in Instructional Course Lectures, Volume 57, which will be published by the American Academy of Orthopaedic Surgeons in March 2008:"Extensor Mechanism Complications After Total Knee Arthroplasty," by Jay Patel, MD, Michael Ries, MD, and Kevin Bozic, MDInstability after total knee arthroplasty is a cause of failure and a reason for 10% to 22% of revisions1-5. Successful outcomes can be obtained in many of these cases, but without identifying the cause of instability, the surgeon risks repeating the mistakes that led to the instability after the initial total knee arthroplasty2,3,6. As Vince et al.6 stated, "the patient's report of instability is not a diagnosis", and particular care should be given to confirming the diagnosis and to understanding the causes.
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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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