Sonobe T, Hakozaki M, Matsuo Y, Takahashi Y, Yoshida K, Konno S. Knee locking caused by osteochondroma of the proximal tibia adjacent to the pes anserinus: A case report. World J Clin Cases 2023; 11(23): 5595-5601 [PMID: 37637681 DOI: 10.12998/wjcc.v11.i23.5595]
Corresponding Author of This Article
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
Research Domain of This Article
Orthopedics
Article-Type of This Article
Case Report
Open-Access Policy of This Article
This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (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: http://creativecommons.org/licenses/by-nc/4.0/
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
Abstract
BACKGROUND
Osteochondroma is one of the most common benign bone tumors, and it may cause bone and joint deformities and limited range of motion of an adjacent joint. The pes anserinus region is one of the most frequent sites of osteochondroma, but knee locking caused by osteochondromas in the pes anserinus region is extremely rare.
CASE SUMMARY
We describe a 13-year-old Japanese girl’s 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 one-year post-surgery.
CONCLUSION
When a young person develops knee locking, the possibility of extra-articular as well as intra-articular locking should be considered. Osteochondroma, one of the causes of extra-articular locking, can be treated with surgery with good postoperative results.
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.
