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Large Femoral-Neck Cysts in Association with Femoroacetabular ImpingementA Report of Three Cases
Klaus-Peter Günther, MD1; Albrecht Hartmann, MD1; Peter Aikele, MD1; Daniela Aust, MD1; Jörg Ziegler, MD1
1 Department of Orthopaedic Surgery (K.-P.G., A.H., and J.Z.), Institute of Radiology (P.A.), and Institute of Pathology (D.A.), University Hospital Carl Gustav Carus, Fetscherstrasse 74, D-01307 Dresden, Germany. E-mail address for K.-P. Günther: klaus-peter.guenther@uniklinikum-dresden.de
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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. No commercial entity paid or directed, or agreed to pay or direct, any benefits to any research fund, foundation, division, center, clinical practice, or other charitable or nonprofit organization with which the authors, or a member of their immediate families, are affiliated or associated.
Investigation performed at the Department of Orthopaedic Surgery, University Hospital Carl Gustav Carus, Dresden, Germany

The Journal of Bone and Joint Surgery, Incorporated
J Bone Joint Surg Am, 2007 Apr 01;89(4):863-870. doi: 10.2106/JBJS.F.00885
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Femoroacetabular impingement is now recognized as a major risk factor for the development of osteoarthritis of the hip1-4. Repetitive microtrauma at maximal flexion not only causes chronic pain from the abutment of the femoral head-neck junction with the acetabulum, but it can also result in structural changes to the hip joint. On the acetabular side, labral tears, cartilage degeneration, and intraosseous as well as paralabral extraosseous cysts are often associated with femoroacetabular impingement1. On the femoral side, juxta-articular fibrocystic changes—so-called herniation pits—have been described at the impingement region on the femoral neck5. In recent studies, the prevalence of fibrocystic changes at the femoral neck was reported to range from 5% to 33% in hips with femoroacetabular impingement6,7; it should be noted, however, that the fibrocystic lesions in those studies were relatively small. Progressive enlargement of cysts associated with femoroacetabular impingement has, to our knowledge, not been reported.
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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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