Extensor Hallucis Longus Tendon Repair: Laceration, Avulsion, and Outcomes

Medically reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatric Surgeon — Balance Foot & Ankle, Howell & Bloomfield Hills, MI. Last updated April 2026.

The extensor hallucis longus (EHL) tendon — running from the anterior compartment of the leg across the dorsal ankle to the distal phalanx of the great toe — is the most commonly lacerated tendon on the dorsal foot, typically from lawnmower injuries, industrial machinery contact, or sharp laceration. EHL tendon injuries require prompt evaluation because retracted tendons, contaminated wounds, and delayed repair significantly worsen outcomes.

Anatomy and Clinical Examination

The EHL runs beneath the superior and inferior extensor retinaculum at the ankle, then continues across the dorsal foot to insert on the dorsal base of the distal phalanx — providing active great toe dorsiflexion. The diagnosis of complete EHL laceration is clinical: inability to actively dorsiflex the great toe against resistance, a palpable tendon defect proximal to the wound (as the proximal stump retracts proximally due to anterior compartment muscle pull), and characteristic drooping of the hallux. Partial lacerations (>50% of the tendon cross-section) should be treated as complete tears to prevent progressive gaping under physiological loads.

Surgical Repair Principles

Acute EHL repair (within 72 hours) through an adequate wound extension provides the most reliable outcomes. The key technical principles: (1) Adequate exposure — the proximal stump retracts under the extensor retinaculum and may require retinaculum incision to retrieve it; (2) Core tendon repair using a modified Kessler or Adelaide suture technique with 3-0 or 4-0 non-absorbable suture; (3) Epitenon repair with running 5-0 absorbable suture to restore gliding surface smoothness; (4) Post-operative immobilization in a toe extension splint or cast for 3–4 weeks, followed by progressive range of motion. In contaminated wounds (lawnmower injuries), delayed primary repair at 48–72 hours after thorough irrigation and debridement is preferable to immediate repair — contaminated primary repair carries high infection and re-tear rates.

EHL Avulsion and Distal Phalanx Fracture

EHL avulsion from the distal phalanx produces a mallet toe deformity of the hallux (flexion deformity of the interphalangeal joint with inability to extend). Bony avulsion (with a small dorsal phalanx fragment) may be treated with splinting in extension if non-displaced; displaced or large fragments require surgical reattachment. Purely ligamentous avulsion without bony fragment is repaired directly to the phalanx through drill holes or suture anchor fixation. Dr. Biernacki at Balance Foot & Ankle performs EHL tendon repair and manages dorsal foot tendon lacerations. Call (810) 206-1402 at our Bloomfield Hills or Howell office for urgent tendon injury evaluation.

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When to See a Podiatrist

Many foot conditions can be managed conservatively at home, but some require professional evaluation. See a podiatrist promptly if you experience:

• Pain that persists for more than 2 weeks despite rest
• Swelling, redness, or warmth that isn’t improving
• Numbness, tingling, or burning in the feet
• A wound or sore that is not healing within 2 weeks
• Any foot concern if you have diabetes or poor circulation
• Nail changes that suggest fungal infection or other problems

At Balance Foot & Ankle, our three board-certified podiatrists — Dr. Tom Biernacki, Dr. Carl Jay, and Dr. Daria Gutkin — provide comprehensive foot and ankle care at our Howell and Bloomfield Township offices. Most insurance plans are accepted.

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Board-certified podiatrists Dr. Tom Biernacki, Dr. Carl Jay, and Dr. Daria Gutkin see patients daily at our Howell and Bloomfield Township, MI offices.

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Tendon Repair Specialists in Michigan

Extensor hallucis longus (EHL) tendon injuries — from lacerations to avulsions — need prompt, expert repair to restore big toe function. Our surgeons have extensive experience with tendon reconstruction.

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Clinical References

1. Al-Qattan MM. Extensor tendon injuries at the musculotendinous junction of the leg. J Hand Surg Br. 2001;26(6):565-568.
2. Borton DC, Omdat R, Rabey D. Closed laceration of the extensor hallucis longus tendon: a report of three cases. Foot Ankle Int. 1997;18(5):304-306.
3. Lipscomb PR, Kelly PJ. Injuries of the extensor tendons in the distal part of the leg and in the ankle. J Bone Joint Surg Am. 1955;37(6):1206-1213.

In-Office Treatment at Balance Foot & Ankle

If home care isn’t resolving your your foot or ankle concern, a visit with a board-certified podiatrist is the fastest path to accurate diagnosis and a personalized plan. At Balance Foot & Ankle Specialists, Dr. Tom Biernacki, Dr. Carl Jay, and Dr. Daria Gutkin offer same-day and next-day appointments at both our Howell and Bloomfield Hills offices. We perform on-site diagnostic ultrasound, digital X-ray, conservative care, advanced regenerative treatments, and minimally invasive surgery when indicated.

Call (810) 206-1402 or request an appointment online. Most insurance plans accepted, including Medicare, Blue Cross Blue Shield, Aetna, Cigna, and United Healthcare.

Most Common Mistake We See

The most common mistake we see is: Waiting too long before seeking care. Fix: any foot pain lasting more than 4 weeks, or any sudden severe symptom, deserves a professional evaluation rather than more rest.

Warning Signs That Need Same-Day Care