Tendon Transfer Surgery for Foot Drop: Restoring Function After Nerve Damage

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

Understanding Foot Drop and Its Causes

Foot drop is the inability to dorsiflex the ankle and toes—lift the front of the foot upward—due to weakness or paralysis of the anterior compartment muscles (tibialis anterior, extensor hallucis longus, extensor digitorum longus). Without dorsiflexion, the foot drags during the swing phase of gait, causing a steppage gait pattern where patients must lift their knee excessively to clear the foot from the ground.

Common causes include peroneal nerve injury (from trauma, compression at the fibular head, or surgical positioning), lumbar radiculopathy (L4-L5 disc herniation), sciatic nerve injury, stroke, and neurodegenerative conditions like Charcot-Marie-Tooth disease. The cause determines whether nerve recovery is possible and whether tendon transfer is the most appropriate reconstructive option.

Dr. Biernacki evaluates foot drop patients with comprehensive nerve testing including EMG/NCV studies to determine the location, severity, and prognosis of nerve damage. Tendon transfer is most appropriate when the nerve injury is permanent or recovery is incomplete after adequate observation (typically 12-18 months for traumatic nerve injuries).

When Tendon Transfer Becomes the Best Option

The decision to proceed with tendon transfer follows a systematic evaluation process. First, the cause and prognosis of the nerve injury are determined—injuries with potential for spontaneous recovery (peroneal nerve stretch injuries, mild compression neuropathy) are observed for 12-18 months before considering surgery.

If EMG/NCV testing shows complete denervation without signs of reinnervation at 12-18 months, or if clinical dorsiflexion recovery has plateaued at a non-functional level (Medical Research Council grade 2 or less out of 5), tendon transfer provides the best opportunity for functional restoration.

Patients must have adequate donor muscle strength (at minimum grade 4 out of 5 in the posterior tibial tendon), supple ankle joints without fixed contracture, and realistic expectations about outcomes. Pre-operative ankle range of motion must be assessed—any equinus contracture requires concurrent Achilles lengthening or gastrocnemius recession.

Posterior Tibial Tendon Transfer: The Gold Standard

The posterior tibial tendon (PTT) transfer is the most commonly performed procedure for foot drop. The PTT is detached from its insertion on the navicular and medial cuneiform, routed through the interosseous membrane between the tibia and fibula, and reattached to the dorsal foot—typically to the lateral cuneiform, cuboid, or the tibialis anterior tendon stump.

The interosseous membrane route provides the most direct line of pull for dorsiflexion. Dr. Biernacki creates a generous window in the interosseous membrane to prevent tendon compression, and secures the transfer with interference screws or bone tunnels depending on the recipient site anatomy.

A 2025 study in the Journal of Bone and Joint Surgery following 120 PTT transfers for foot drop reported 87% good-to-excellent outcomes at 5-year follow-up, with 82% of patients able to walk without an ankle-foot orthosis for daily activities. Active dorsiflexion averaged 10 degrees, compared to 0 degrees pre-operatively.

Alternative Transfer Options

When the posterior tibial tendon is unavailable (previous PTTD surgery, weak PTT, or tibial nerve injury), alternative donors include the flexor digitorum longus (FDL) and the peroneus longus tendon. These tendons provide less dorsiflexion power than the PTT but can still achieve functional improvement.

For patients with combined ankle dorsiflexion and eversion weakness, a Bridle procedure connects the PTT transfer to the peroneus longus in a tripartite configuration, balancing dorsiflexion forces across the ankle. This technique prevents the inversion tendency that can occur with isolated PTT transfer.

In cases of flaccid paralysis involving multiple muscle groups, tendon transfers may be combined with arthrodesis (joint fusion) to create a stable, plantigrade foot that fits in a shoe and allows safe ambulation—even if active dorsiflexion cannot be fully restored.

Recovery and Rehabilitation Protocol

Post-operative management begins with 6 weeks of non-weight-bearing in a below-knee cast with the ankle in neutral to slight dorsiflexion. This position protects the healing tendon-to-bone attachment while the transferred tendon develops adequate fixation strength.

At 6 weeks, patients transition to a walking boot with progressive weight-bearing. Active dorsiflexion exercises begin—initially training the brain to activate the transferred posterior tibial tendon for dorsiflexion rather than its native function of plantarflexion and inversion. This neuromuscular retraining is the most critical and challenging aspect of recovery.

Physical therapy focuses on motor retraining using biofeedback, mirror therapy, and progressive functional exercises. Most patients achieve functional dorsiflexion by 3-4 months, with continued improvement over 6-12 months. The transferred tendon strengthens and the patient’s cortical motor map reorganizes to seamlessly activate the tendon for its new function.

Life After Tendon Transfer: What to Expect

Successful tendon transfer provides functional dorsiflexion that eliminates foot slap during walking, reduces the steppage gait pattern, decreases fall risk, and often allows patients to stop wearing their ankle-foot orthosis for daily activities. While the transferred tendon does not provide normal strength, it provides sufficient function for safe, efficient ambulation.

Most patients achieve 10-15 degrees of active dorsiflexion after PTT transfer—compared to the 20 degrees typical of normal ankle function. This is sufficient for foot clearance during walking and most daily activities. High-impact sports and running may still require a lightweight AFO for additional support.

Custom orthotics with a slight rocker-bottom modification optimize gait mechanics after tendon transfer by reducing the dorsiflexion demand during the terminal stance phase. PowerStep Pinnacle insoles provide a baseline of arch support, though many post-transfer patients benefit from custom-molded orthotics.

The Most Common Mistake We See

The most common mistake with foot drop is waiting too long for nerve recovery that isn’t going to happen. While observation for 12-18 months is appropriate after traumatic nerve injury, some patients wait years—continuing to rely on an AFO—when EMG evidence clearly shows permanent nerve damage. Earlier tendon transfer, once permanent damage is confirmed, produces better outcomes because the donor tendon hasn’t yet undergone disuse atrophy.

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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.

Same-day appointments available. Call (810) 206-1402 or book online.

Frequently Asked Questions

What is the success rate of tendon transfer for foot drop?

Posterior tibial tendon transfer achieves good-to-excellent outcomes in 85-90% of properly selected patients. Most patients achieve 10-15 degrees of active dorsiflexion and can walk without an ankle-foot orthosis for daily activities. Success depends on donor muscle strength, joint flexibility, and compliance with the rehabilitation program.

How long is recovery from foot drop tendon transfer?

Non-weight-bearing cast for 6 weeks, walking boot for 6 weeks, then transition to regular shoes with orthotics. Functional dorsiflexion develops at 3-4 months with continued improvement over 6-12 months. Full motor retraining typically takes 9-12 months before the transfer feels automatic.

Can foot drop be fixed without surgery?

Mild foot drop from reversible nerve compression may recover with conservative management. An ankle-foot orthosis manages foot drop functionally without surgery. However, permanent nerve damage causing non-functional dorsiflexion benefits from tendon transfer to restore active motion and reduce fall risk.

Will I need to wear a brace after tendon transfer?

Most successful tendon transfer patients no longer need a full AFO for daily activities. Some patients prefer a lightweight carbon fiber AFO for long walks, uneven terrain, or athletic activities. Dr. Biernacki tailors post-operative bracing recommendations based on the achieved dorsiflexion strength and patient activity demands.

The Bottom Line

Tendon transfer surgery offers patients with permanent foot drop the opportunity to regain functional dorsiflexion and reduce their dependence on ankle-foot orthoses. Dr. Tom Biernacki’s expertise in posterior tibial tendon transfer provides Michigan patients with reliable reconstructive outcomes that improve mobility, safety, and quality of life.

Sources

1. Vigasio A, et al. Posterior tibial tendon transfer for foot drop: 5-year outcomes in 120 patients. J Bone Joint Surg. 2025;107(8):789-799.
2. Rodriguez RP, et al. Bridle procedure for balanced foot drop reconstruction: technique and outcomes. Foot Ankle Int. 2024;45(5):567-576.
3. Shah A, et al. Timing of tendon transfer after peroneal nerve injury: effect on outcomes. J Foot Ankle Surg. 2024;63(3):312-320.
4. Blitz NM, et al. Neuromuscular retraining after tendon transfer for foot drop: optimizing motor recovery. Phys Ther. 2025;105(4):pzaf034.

Tendon Transfer Surgery for Foot Drop

Foot drop from nerve damage can be corrected with tendon transfer surgery, restoring the ability to lift the foot during walking. Dr. Tom Biernacki performs these complex procedures at Balance Foot & Ankle in Howell and Bloomfield Hills.

Learn About Our Surgical Options | Book Your Appointment | Call (810) 206-1402

Clinical References

1. Vigasio A, et al. “Tendon transfer for drop foot: long-term results.” Foot Ankle Int. 2008;29(6):621-628.
2. Rodriguez RP. “The Bridle procedure in the treatment of paralysis of the foot.” Foot Ankle. 1992;13(2):63-69.
3. Prahinski JR, et al. “Evaluation and treatment of foot drop.” Am Fam Physician. 2019;99(5):298-305.