Extensor Tendon Injuries of the Foot: Lacerations, Ruptures, and Surgical Repair

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

Understanding Extensor Tendons of the Foot

The extensor tendons run along the top (dorsal surface) of the foot, connecting the muscles in the anterior leg compartment to the toes. The extensor hallucis longus controls big toe extension, while the extensor digitorum longus branches into four slips extending the lesser toes. These tendons are remarkably superficial — covered by only thin skin and minimal subcutaneous tissue — making them vulnerable to laceration injuries.

Because of their exposed position, extensor tendons are the most commonly lacerated tendons in the foot. Dropping sharp objects like knives or glass, stepping on broken glass, lawnmower injuries, and workplace accidents account for the majority of cases. Even relatively shallow lacerations on the dorsal foot can sever an extensor tendon completely.

Each extensor tendon has a specific functional role. Complete laceration of the extensor hallucis longus eliminates active big toe dorsiflexion, impairing push-off during walking and creating a tripping hazard. Lesser toe extensor lacerations cause the affected toes to drag during the swing phase of gait, leading to stumbling and compensatory gait changes.

Diagnosis of Extensor Tendon Lacerations

Clinical examination is the primary diagnostic tool for extensor tendon injuries. Dr. Biernacki tests each tendon individually by asking the patient to extend each toe against resistance while palpating the tendon through the wound. Inability to actively extend a toe against gravity confirms complete tendon laceration.

Partial tendon lacerations are more challenging to diagnose because the patient may retain weak extension through the intact tendon fibers. Pain with resisted toe extension and visible tendon damage within the wound suggest partial injury that may progress to complete rupture without surgical repair.

Wound exploration in a controlled clinical setting determines the extent of tendon damage, identifies involvement of multiple tendons, and evaluates for concurrent injuries to the dorsalis pedis artery, deep peroneal nerve, or underlying bones. X-rays rule out fractures and retained foreign bodies such as glass fragments that may not be visible on surface examination.

The Thompson-like test for the foot — squeezing the anterior leg muscles to observe passive toe extension — helps confirm continuity of the musculotendinous unit when pain or swelling limits active testing.

Surgical Repair of Extensor Tendon Injuries

Primary surgical repair within 7 to 14 days of injury produces the best outcomes for extensor tendon lacerations. The repair involves direct end-to-end suturing of the severed tendon ends using modified Kessler or Bunnell suture techniques that provide adequate strength during the healing period.

Dr. Biernacki performs extensor tendon repairs under local anesthesia with regional nerve block for patient comfort. The procedure involves thorough wound irrigation, debridement of contaminated or devitalized tissue, careful tendon end identification and alignment, core suture placement, and running epitendinous suture to smooth the repair surface and prevent adhesion formation.

Delayed presentations beyond two to three weeks face the challenge of tendon retraction and scarring at the severed ends. These cases may require tendon grafting, V-Y advancement, or side-to-side transfer from an adjacent tendon to bridge the gap and restore function.

Concurrent injuries to the dorsalis pedis artery require vascular repair or ligation to prevent hemorrhage and ensure adequate perfusion to the forefoot. Deep peroneal nerve injuries may be repaired primarily or require referral to a microsurgical specialist depending on the extent of nerve damage.

Recovery and Rehabilitation After Tendon Repair

Postoperative immobilization in a short leg cast or controlled ankle motion (CAM) boot with toe extension plate protects the repair for four to six weeks. The ankle is positioned in slight plantarflexion and the toes in neutral to slight extension to minimize tension on the suture line during the initial healing phase.

Gentle active range-of-motion exercises begin at four to six weeks under the guidance of a physical therapist. Early controlled motion prevents adhesion formation that could limit tendon gliding and restrict toe extension. The Kleinert protocol using rubber band traction allows passive flexion with active extension to promote tendon excursion while protecting the repair.

Progressive strengthening exercises begin at eight to twelve weeks as the repair gains tensile strength. Resistance exercises, toe curls against elastic bands, and marble pickup exercises rebuild extensor power and coordination.

Full return to sports and unrestricted activity typically occurs at twelve to sixteen weeks for uncomplicated repairs. Patients with tendon grafts or delayed reconstructions may require longer rehabilitation periods to achieve optimal functional outcomes.

Preventing Foot Laceration Injuries

Protective footwear is the single most effective prevention strategy for extensor tendon lacerations. Steel-toed or composite-toed boots prevent workplace injuries from falling objects. Wearing shoes rather than walking barefoot in kitchens, garages, and outdoor areas where glass or sharp objects may be present eliminates most domestic laceration injuries.

Lawnmower safety requires wearing sturdy closed-toe shoes, never operating push mowers in sandals or bare feet, and keeping bystanders at safe distances. Lawnmower injuries to the foot are among the most devastating, frequently involving multiple tendon lacerations, fractures, and soft tissue loss.

Prompt wound care for any laceration on the top of the foot — even if it appears superficial — should include assessment for tendon injury. Any wound that prevents active toe extension requires urgent evaluation by a foot and ankle specialist.

The Most Common Mistake We See

The most common mistake is assuming a laceration on the top of the foot is just a skin wound because it looks small. The extensor tendons lie millimeters beneath the skin surface — a wound that appears minor externally may have completely severed one or more tendons. Every dorsal foot laceration should be evaluated for tendon integrity by testing active toe extension before wound closure. Missing an extensor tendon laceration leads to chronic toe drop deformity that becomes much more difficult to repair surgically weeks or months later.

In-Office Treatment at Balance Foot & Ankle

Our team provides sport-specific evaluation and treatment to get you back to your activity safely. We offer same-day X-ray, in-office ultrasound, and custom orthotic fabrication.

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Frequently Asked Questions

How do I know if I cut an extensor tendon in my foot?

If you cannot actively lift one or more toes after a laceration on the top of your foot, an extensor tendon may be severed. Even if the wound appears small, any loss of toe extension after a dorsal foot laceration requires urgent evaluation by a foot specialist.

Can a cut extensor tendon heal without surgery?

Partial lacerations involving less than 50 percent of the tendon width may heal with immobilization alone. Complete extensor tendon lacerations generally require surgical repair for optimal functional recovery. Without repair, the affected toe typically develops permanent drop deformity.

How long does extensor tendon repair recovery take?

Full recovery from extensor tendon repair takes 12 to 16 weeks. Immobilization lasts 4 to 6 weeks, followed by progressive rehabilitation including range-of-motion exercises and strengthening. Return to sports and unrestricted activity occurs around 12 to 16 weeks for uncomplicated repairs.

Will I be able to move my toes normally after tendon repair?

Most patients achieve good to excellent toe extension after primary surgical repair, with satisfaction rates above 85 percent. Early repair within 14 days and adherence to the rehabilitation protocol produce the best functional outcomes. Some residual stiffness is common but usually does not limit daily activities.

The Bottom Line

Extensor tendon lacerations require prompt diagnosis and surgical repair to prevent permanent toe deformity. Dr. Tom Biernacki at Balance Foot & Ankle provides expert tendon repair and comprehensive rehabilitation guidance to restore normal toe function after dorsal foot injuries. Early evaluation of any laceration on the top of the foot is essential for optimal outcomes.

Sources

1. Griffin M et al. Extensor tendon injuries of the foot: surgical management and outcomes. Foot Ankle Surg. 2024;30(2):145-153.
2. Jeng CL. Tendon lacerations of the foot and ankle. Clin Podiatr Med Surg. 2025;42(1):67-78.
3. Pedowitz DI. Acute tendon injuries in the foot and ankle. J Am Acad Orthop Surg. 2024;32(8):345-356.

Expert Extensor Tendon Repair at Balance Foot & Ankle

Extensor tendon lacerations and injuries in the foot require precise surgical repair for optimal recovery. Dr. Tom Biernacki performs tendon repair procedures to restore full toe extension and foot function.

Learn About Foot Surgery Options → | Book Your Appointment | Call (810) 206-1402

Clinical References

1. Rockwell WB, et al. “Extensor tendon injuries of the foot.” Foot Ankle Clin. 2002;7(3):501-513.
2. Newport ML. “Extensor tendon injuries in the hand.” J Am Acad Orthop Surg. 1997;5(2):59-66.
3. Heckman JD, et al. “Extensor tendon lacerations of the foot.” J Foot Ankle Surg. 2005;44(2):98-102.

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