EHL is the key muscle for hallux clearance during swing phase. Its weakness produces drop hallux. It is the most selectively affected muscle in L5 radiculopathy and deep peroneal neuropathy.
An expanded entry for Extensor Hallucis Longus.
| Origin | Middle half of the anterior fibula and interosseous membrane |
|---|---|
| Insertion | Base of the distal phalanx of the hallux |
| Nerve Supply | Deep peroneal nerve (L4, L5) |
| Blood Supply | Anterior tibial artery |
| Actions |
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|---|
It extends the big toe and assists dorsiflexion of the ankle, lifting the big toe during the swing phase of walking.
EHL weakness distinguishes L5 radiculopathy from common peroneal palsy. In anterior tarsal tunnel syndrome, EHL weakness may be selective. EHL tendon laceration requires prompt repair.
Palpated on the dorsum of the foot as the central tendon during resisted hallux extension.
Selective EHL weakness producing big toe drop in gait, confirmed by EMG and managed by discectomy or conservative care.
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