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Bilateral Extensor Hallucis Longus Minor: A Case Report
Author(s) -
Lucaciu Calin,
Hockley Sarah
Publication year - 2008
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.22.2_supplement.13
Subject(s) - anatomy , medicine , tendon , muscle belly , ankle , cadaver , dorsum , interosseous membrane , proximal phalanx , flexor digitorum longus , surgery , ulna
This case report describes a bilateral variation in the origin and distal attachment of the extensor hallucis longus (EHL) muscle, whereby a secondary distinct muscle belly and tendon are present in an adult human cadaver – Extensor Hallucis Longus Minor (EHLM). EHLM originates from the interosseus membrane just medial to, and at the same level as, the origin of Fibularis Tertius. The muscle is unipennate and descends through the anterior tarsal tunnel between the tendons of Extensor Hallucis Longus (EHL) and Extensor Digitorum Longus (EDL). At the level of the dorsal surface of the navicular bone, the muscle fibers converge into a tendon (4 mm in width, 13 mm in length) that joins the tendon of Extensor Hallucis Brevis (EHB). The united tendon of EHLM and EHB courses just lateral to the tendon of EHL and attaches onto the dorsal aspect of the proximal phalanx of great toe. EHLM is innervated by two branches of the deep fibular nerve, originating 5 cm and 8 cm superior to the bimaleolar line. EHLM is analyzed from the perspective of: 1) proper identification through the use of MRI and CT scans; 2) clinical implications related to the anterior tarsal syndrome; 3) biomechanics of the great toe; 4) entrapment of the deep fibular nerve at the level of dorsum of the foot; 5) in the lateral ankle stabilization surgery as an alternative flap muscle.