Nerve and Tendon Transfers

Introduction

When a peripheral nerve is injured too proximally or too late for primary repair to restore meaningful function, the question becomes how else to rewire the limb. Two complementary strategies answer that question. Nerve transfers route a working nerve to power a paralyzed muscle by reconnecting them surgically. Tendon transfers reroute a working muscle's tendon to perform the action of a paralyzed muscle. Both are reconstructive operations grounded in the same principle: borrow function from where it is preserved to restore function where it is lost.

This page covers when each is indicated, what conditions are most often treated this way, and what realistic outcomes look like. The discussion focuses on tendon transfers in the upper extremity — where the work is densest — and on nerve transfers in both upper and lower extremity. For broader peripheral nerve content including primary nerve repair, RPNI, and TMR, see the [peripheral nerve surgery page] and the [TMR and RPNI page].

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What are nerve and tendon transfers?

A nerve transfer reconnects nerves. An expendable motor nerve branch close to a paralyzed muscle is divided and sutured to the injured nerve under the operating microscope. The regenerating axons travel a short distance through the existing nerve pathway and reinnervate the target muscle. Recovery is measured in months. Hand therapy retrains the cortex to use the new neural input, since the new motor command originates from a different brain region than the original.

A tendon transfer reroutes mechanical force. A functioning muscle's tendon is detached from its insertion, passed to a new location, and sewn into a new attachment site so that the existing muscle now performs a different action. Recovery is measured in weeks rather than months because the muscle is already innervated and contracting; the brain only needs to learn to use it differently.

The choice between the two — or between either and a primary nerve repair — depends on three factors above all others. The first is the time since the original injury. The second is the level of injury and its distance from the target muscle. The third is what donor nerves and donor tendons are available.

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Brachial Plexus Injuries

The brachial plexus is the network of nerves that travels from the cervical spine through the shoulder and into the arm. Severe brachial plexus injuries — most commonly from motorcycle crashes, falls from height, or birth-related stretch injuries — produce paralysis of the shoulder, elbow, hand, or any combination, depending on which roots are involved.

Adult brachial plexus surgery is dominated by time pressure. The distance from the cervical spine to the hand is too long for axons regenerating at one millimeter per day to reach distal targets before motor endplates degrade irreversibly, generally within 12 to 18 months. Distal nerve transfers solve this distance problem by recruiting an expendable motor nerve close to the target. Common transfers include the spinal accessory nerve to the suprascapular nerve to restore shoulder external rotation, fascicles of the ulnar or median nerve to the musculocutaneous nerve to restore elbow flexion, and intercostal nerves to power free functional muscle transfers in patients with global plexus injuries.

When nerve transfers cannot fully restore function — or when the patient presents too late for any nerve-based approach — tendon transfers and free functional muscle transfers extend the reconstructive options. Brachial plexus and peripheral nerve work is an explicit clinical focus of my practice.

Pediatric brachial plexus surgery, particularly for obstetric birth palsy, follows different principles than adult surgery because of children's faster regeneration, shorter limbs, and superior cortical plasticity. Outcomes from early surgical intervention in selected infants can be substantial.

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Nerve Trauma in the Upper Extremity

The most common upper extremity application of nerve transfer is the high ulnar nerve injury — a nerve cut at or near the elbow with a target (the intrinsic muscles of the hand) too distant for primary repair to reach in time. The transfer of choice in many of these cases is the anterior interosseous nerve to the deep motor branch of the ulnar nerve at the wrist, performed end-to-side or end-to-end depending on circumstance. This recruits a working motor nerve from the median nerve distribution to power the ulnar-innervated intrinsic muscles, dramatically shortening the regeneration distance.

Similar principles apply to high radial nerve injuries (transfer of median nerve fascicles to restore wrist and finger extension) and high median nerve injuries. The published literature supports nerve transfer as the preferred approach for many proximal injuries that present beyond the window for traditional repair.

When nerve transfer is not feasible — because of timing, prior surgery, or the absence of suitable donor nerves — tendon transfers remain the reliable salvage. For ulnar nerve palsy specifically, I co-authored a chapter in Operative Techniques in Hand and Wrist Surgery on tendon transfers for low and high ulnar nerve palsy, addressing the technical execution of the standard transfers and how to choose among them based on which intrinsic functions are most important to the individual patient.

Carpal Tunnel Syndrome and Severe Nerve Compression

Carpal tunnel syndrome is treated primarily by decompression, not by transfer. However, in the small subset of patients with very severe long-standing compression and established thenar muscle atrophy, decompression alone may not restore opposition of the thumb. In those cases, opponensplasty — a tendon transfer that restores thumb opposition by rerouting a working tendon to substitute for the paralyzed abductor pollicis brevis — can meaningfully improve hand function. This is a salvage option, offered when the timeline of compression has already produced irreversible motor loss.

For broader discussion of carpal tunnel and other compression syndromes, see the [nerve decompression page].

Lower Extremity Nerve Transfers

Nerve transfer in the lower extremity is less common than in the upper extremity but has clearly defined indications. The most established example is the peroneal nerve injury producing foot drop. When primary repair or grafting is unlikely to restore function in time — typically because of late presentation or severe injury — transfer of a tibial nerve motor branch to the deep peroneal nerve can restore dorsiflexion in selected patients. My research group at Dell presented work on this question at the American Society for Peripheral Nerve, including a poster on a modern evidence-based treatment algorithm for peroneal nerve injury that addresses when to observe, when to decompress, when to graft, and when to transfer.

Other lower extremity nerve transfers — for sciatic nerve injury, femoral nerve injury, and selected pelvic plexus injuries — exist in the literature but are less commonly performed. The decision to attempt a lower extremity nerve transfer is individualized and depends on the level of injury, the time elapsed, and what donor nerves are available.

When nerve transfer cannot restore foot dorsiflexion, tendon transfer (typically the posterior tibial tendon transferred to the dorsum of the foot) provides a durable alternative. This is most often performed by foot and ankle surgery in collaboration with peripheral nerve surgery.

Stroke and Spinal Cord Injury

Patients with chronic upper limb dysfunction from stroke or spinal cord injury represent a meaningfully different population from those with peripheral nerve injuries. The motor problem in stroke and spinal cord injury is upstream — the brain or spinal cord — rather than at the peripheral nerve level. The peripheral nerves and the muscles they supply are anatomically intact. The voluntary signal to use them is the part that has been disrupted.

For these patients, two reconstructive strategies have a defined role. Tendon transfers reroute the action of muscles that retain voluntary control to perform functions lost from muscles that no longer have voluntary control. In tetraplegia, for example, an actively controlled wrist extensor can be rerouted to provide finger flexion, restoring grasp in patients with mid-cervical spinal cord injury. The Moberg and related procedures have a long history in this population. Nerve transfers in spinal cord injury patients use a different principle — recruiting a nerve still under voluntary control above the injury level and reconnecting it to a peripheral nerve below the injury, restoring voluntary command of muscles that retain peripheral innervation but have lost their cortical input. Published series in cervical spinal cord injury have demonstrated meaningful functional restoration in selected patients.

For post-stroke spasticity and contracture, surgical management often combines tendon lengthening, selective tendon transfer, joint releases, and management of the spastic muscle itself — typically in coordination with physical medicine and rehabilitation, neurology, and hand therapy.

Outcomes

Nerve transfers and tendon transfers are reconstructive operations, not restorations of normal function. The honest framing is that both can substantially improve function in appropriately selected patients, but neither restores the original anatomy.

For nerve transfers, recovery proceeds over months as regenerating axons reach the target muscle and as the cortex retrains to use the new input. The published outcomes are generally favorable for distal transfers performed at appropriate timing in motivated patients, with meaningful recovery of strength in many series. Outcomes worsen with longer delays from injury, with proximal injuries that have multiple targets to reinnervate, and with patients who do not engage with the rehabilitation process.

For tendon transfers, recovery is faster — most patients begin protected motion within weeks of surgery and progress through structured hand therapy over the following months. Outcomes are predictable when the donor muscle has adequate strength, when the line of pull is correct, and when the rehabilitation is disciplined. Patients with poor donor muscles, severe joint stiffness, or limited engagement with therapy do not achieve the potential of the operation.

Risks

Both nerve and tendon transfers share the general surgical risks: bleeding, infection, scarring, and incomplete restoration of function. Specific risks include donor site weakness from the muscle or nerve borrowed for the transfer (generally well tolerated when standard donors are used), failure of the transferred nerve to reinnervate the target, joint stiffness from prolonged immobilization, tendon adhesion limiting the excursion of a transferred tendon, and the rare possibility of new pain at the surgical site. Patients should expect a substantial post-operative recovery period before the full result of the operation is realized.

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Written by Brian P. Kelley, MD — Dual Board-Certified Plastic & Hand Surgeon Medically reviewed: May 4, 2026 · Last updated: May 4, 2026 Educational content. Not a substitute for individualized medical evaluation.

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Medical References

1. Fujihara Y, Kelley BP, Chung KC, Waljee JF. Tendon Transfers for Low and High Ulnar Nerve Palsy. In: Chung KC (ed): Operative Techniques in Hand and Wrist Surgery, 3rd edition. Elsevier.
2. Kelley BP, Chung KC. Tendon Transfers for Rheumatoid Tendon Attrition Rupture. In: Chung KC (ed): Operative Techniques in Hand and Wrist Surgery, 3rd edition. Elsevier.
3. Kelley BP, Chung KC. Cross Intrinsic Transfer, Extensor Tendon Centralization, and Metacarpophalangeal Joint Synovectomy. In: Chung KC (ed): Operative Techniques in Hand and Wrist Surgery, 3rd edition. Elsevier.
4. Bashour L, Schafer H, Khan U, Kelley BP, Egeland BM. Peroneal Nerve Injury: A Modern Evidence-Based Treatment Algorithm. ePoster, American Society for Peripheral Nerve, Annual Meeting, January 2021.
5. Hooper RC, Cederna PS, Brown DL, Haase SC, Waljee JF, Egeland BM, Kelley BP, Kung TA. Regenerative Peripheral Nerve Interfaces for the Management of Symptomatic Hand and Digital Neuromas. Plastic and Reconstructive Surgery — Global Open. 2020;8(6):e2792. PMID: 32766027.
6. American Society for Peripheral Nerve: https://www.peripheralnerve.org/.
7. American Society for Surgery of the Hand: https://www.assh.org/.
8. Dr. Brian P. Kelley faculty profile, Dell Medical School, The University of Texas at Austin: [INSERT VERIFIED PROFILE URL].

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Related Topics

• Peripheral nerve surgery, RPNI, and TMR — overview
• Nerve repair and reconstruction
• Nerve decompression surgery
• Chronic Hand and Wrist Conditions
• TMR and RPNI for nerve pain and amputations
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Closing Disclaimer

This article is educational and does not establish a doctor-patient relationship. It does not replace individualized consultation, examination, or review of personal medical history. Patients with nerve injuries, brachial plexus injuries, or upper limb dysfunction from stroke or spinal cord injury are encouraged to schedule a consultation to discuss their specific situation and reconstructive options.