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The Checkrein Deformity of Extensor Hallucis Longus Tendon and Extensor Retinaculum Syndrome with Deep Peroneal Nerve Entrapment after Triplane Fracture: A Case Report
J Korean Foot Ankle Soc 2021;25:145-148
Published online September 15, 2021;
© 2021 Korean Foot and Ankle Society

Hyungon Gwak, Jungtae Ahn, Jae Hoon Lee

Department of Orthopedic Surgery, Kyung Hee University Hospital at Gangdong, Seoul, Korea
Correspondence to: Jungtae Ahn
Department of Orthopedic Surgery, Kyung Hee University Hospital at Gangdong, 892 Dongnam-ro, Gangdong-gu, Seoul 05278, Korea
Tel: 82-2-440-6213, Fax: 82-2-440-7498, E-mail:
Received January 11, 2021; Revised March 11, 2021; Accepted March 15, 2021.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
A checkrein deformity can occur after a distal tibiofibular fracture. Usually, a checkrein deformity due to a dysfunction of the extensor hallucis longus muscle is rarer than that of the flexor hallucis longus. Only a few related studies have been reported. The authors encountered an extensor hallucis longus checkrein deformity due to extensor retinaculum syndrome while managing a triplane fracture. In magnetic resonance imaging, an increase in the heterogeneous signal was observed on the T2-weighted images suggesting muscle necrosis or ischemic changes in a part of the extensor hallucis muscle. Postoperative great toe motor weakness, unintentional movement, sensory changes, and weakness improved spontaneously during the follow-up.
Keywords : Checkrein deformity, Extensor hallucis longus, Extensor retinaculum syndrome, Triplane fracture

September 2021, 25 (3)