Snapping Knee due to a Femoral Osteochondroma after Total Knee Arthroplasty
Sang Jun Song, MD, PhD1, Dae Kyung Bae, MD, PhD2, and Cheol Hee Park, MD3
1Department of Orthopaedic Surgery, College of Medicine, Kyung Hee University, Seoul; 2Department of Orthopaedic Surgery, Seoul Sacred Heart General Hospital, Seoul; 3Department of Medicine, Graduate School, Kyung Hee University, Seoul, Korea
Correspondence to: Cheol Hee Park, MD
Department of Medicine, Graduate School, Kyung Hee University, 23 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Korea
Tel: +82-2-958-9489, Fax: +82-2-964-3865
E-mail: rdohead@hanmail.net
Received: January 8, 2019; Revised: February 6, 2019; Accepted: February 18, 2019; Published online: March 18, 2019.
© Korean Knee Society. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
A female patient who underwent total knee arthroplasty presented with a snapping sensation over the left knee at 10 years postoperatively. Initially, the bony mass was visible on the medial femoral condyle radiographically at 5 years postoperatively. The mass had enlarged over time and her symptoms were progressive. The mass was excised at postoperative 18 years and confirmed as an osteochondroma histopathologically. The patient’s symptoms have been completely resolved for 3-year follow-up after excision.
Keywords: Knee, Arthroplasty, Osteochondroma, Snapping


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