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Case Reports in Medicine
Volume 2010, Article ID 705919, 5 pages
Case Report

Large Intra-Articular Anterior Cruciate Ligament Ganglion Cyst, Presenting with Inability to Flex the Knee

1Department of Orthopaedics, Ealing Hospital, Southall, London UB13HW, UK
2Department of Orthopaedics, Northwick Park Hospital, Harrow, London HA13UJ, UK

Received 1 November 2010; Accepted 22 December 2010

Academic Editor: Tyng-Guey Wang

Copyright © 2010 Jake Sloane et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A 41-year-old female presented with a 3-month history of gradually worsening anterior knee pain, swelling and inability to flex the knee. Magnetic resonance imaging (MRI) revealed a large intra-articular cystic swelling anterior to the anterior cruciate ligament (ACL), extending into the Hoffa's infrapatellar fat pad. Following manipulation under anaesthesia and arthroscopic debridement of the cyst, the patient's symptoms were relieved with restoration of normal knee motion. ACL ganglion cysts are uncommon intra-articular pathological entities, which are usually asymptomatic and diagnosed incidentally by MRI. This is the first reported case of an ACL cyst being so large as to cause a mechanical block to knee flexion.