Case Report
Copyright ©The Author(s) 2023. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Clin Cases. Aug 16, 2023; 11(23): 5595-5601
Published online Aug 16, 2023. doi: 10.12998/wjcc.v11.i23.5595
Knee locking caused by osteochondroma of the proximal tibia adjacent to the pes anserinus: A case report
Tatsuru Sonobe, Michiyuki Hakozaki, Yohei Matsuo, Yojiro Takahashi, Katsuhiro Yoshida, Shinichi Konno
Tatsuru Sonobe, Michiyuki Hakozaki, Shinichi Konno, Department of Orthopaedic Surgery, Fukushima Medical University School of Medicine, Fukushima 960-1295, Japan
Tatsuru Sonobe, Yohei Matsuo, Department of Orthopaedic Surgery, Fukushima General Health and Welfare Centre, Fukushima 963-8041, Japan
Michiyuki Hakozaki, Higashi-Shirakawa Orthopaedic Academy, Fukushima Medical University School of Medicine, Fukushima 960-1295, Japan
Yojiro Takahashi, Katsuhiro Yoshida, Department of Orthopaedic Surgery, Fujita General Hospital, Fukushima 969-1793, Japan
Author contributions: Sonobe T and Matsuo Y performed the patient’s surgery; Takahashi Y and Yoshida K were involved in the patient care; Sonobe T wrote the manuscript; Matsuo Y, Takahashi Y, Yoshida K, Hakozaki M, and Konno S were involved in the manuscript preparation and review; and all authors read and approved the final manuscript.
Informed consent statement: Informed written consent was obtained from the patients for the publication of this report and any accompanying images.
Conflict-of-interest statement: The authors declare that they have no conflicts of interest.
CARE Checklist (2016) statement: The authors have read the CARE Checklist (2016), and the manuscript was prepared and revised according to the CARE Checklist (2016).
Open-Access: This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: https://creativecommons.org/Licenses/by-nc/4.0/
Corresponding author: Michiyuki Hakozaki, MD, PhD, Professor, Department of Orthopaedic Surgery, Fukushima Medical University School of Medicine, 1 Hikarigaoka, Fukushima-shi, Fukushima 960-1295, Japan. paco@fmu.ac.jp
Received: May 22, 2023
Peer-review started: May 22, 2023
First decision: June 19, 2023
Revised: June 27, 2023
Accepted: July 25, 2023
Article in press: July 25, 2023
Published online: August 16, 2023
Processing time: 85 Days and 18.8 Hours
Core Tip

Core Tip: Osteochondroma is one of the most common benign bone tumors, but extra-articular knee locking caused by osteochondroma in the pes anserinus region is extremely rare. We report a case of extra-articular knee locking that occurred when the semitendinosus tendon got caught in osteochondroma that had developed in the pes anserinus region. The osteochondroma was surgically resected. The postoperative outcome has been excellent with no recurrence of knee locking or tumor 3 mo post-surgery.