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What Is Ulnar Nerve Transposition?

Ulnar nerve transposition is surgery that moves the ulnar nerve from behind the medial epicondyle to a new position in front of the elbow. The goal is to reduce compression, stretching, or repeated snapping of the nerve during elbow motion. The nerve can be placed beneath the skin, within muscle, or beneath muscle depending on the selected technique. Transposition is one surgical option for cubital tunnel syndrome and other forms of ulnar nerve instability at the elbow.

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What Is Ulnar Nerve Transposition?

Ulnar nerve transposition is surgery that moves the ulnar nerve from behind the medial epicondyle to a new position in front of the elbow. The goal is to reduce compression, stretching, or repeated snapping of the nerve during elbow motion. The nerve can be placed beneath the skin, within muscle, or beneath muscle depending on the selected technique. Transposition is one surgical option for cubital tunnel syndrome and other forms of ulnar nerve instability at the elbow.

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Why Is Ulnar Nerve Transposition Performed?

The procedure is considered when ulnar neuropathy at the elbow causes persistent numbness, weakness, muscle wasting, or functional impairment despite appropriate nonsurgical care. Transposition can be favored when the nerve subluxates over the medial epicondyle, when local anatomy places persistent tension on the nerve, or during selected revision operations. Severe compression or elbow deformity can also influence the choice of technique. Simple in-situ decompression remains appropriate for many patients, so transposition is not required for every case of cubital tunnel syndrome.

How Is Ulnar Nerve Transposition Performed?

The surgeon makes an incision along the inside of the elbow and decompresses the ulnar nerve through the areas where it can be constricted. The nerve is mobilized carefully while preserving its blood supply and important motor branches. It is then moved anterior to the medial epicondyle and placed in a subcutaneous, intramuscular, or submuscular bed. The surgeon checks that the nerve lies without excessive tension, kinking, or recurrent instability as the elbow moves.

What Is Recovery Like After Ulnar Nerve Transposition?

The elbow can be protected in a dressing or splint during early healing, particularly after submuscular transposition. Motion is introduced according to the technique so stiffness is minimized while the surgical tissues heal. Hand and elbow therapy can restore range of motion, strength, and functional use. Nerve recovery is gradual, and numbness or weakness caused by severe longstanding compression can continue improving for many months or remain incomplete.

What Are the Risks and Complications?

Possible complications include infection, bleeding, stiffness, painful scarring, persistent numbness, weakness, and recurrent nerve symptoms. The medial antebrachial cutaneous nerve can be irritated or injured, causing numbness or painful sensitivity near the inner elbow and forearm. The transposed ulnar nerve can develop scar-related tethering, new compression, instability, or impaired blood supply. Revision surgery can be required when symptoms persist or recur.

Frequently Asked Questions About Ulnar Nerve Transposition

Is ulnar nerve transposition the same as cubital tunnel release?

Not exactly. Cubital tunnel release decompresses the nerve, while transposition also moves the nerve to a new position in front of the medial epicondyle.

Where is the ulnar nerve moved during transposition?

The nerve is moved anterior to the medial epicondyle. It can be placed beneath the skin, within muscle, or beneath muscle depending on the technique.

Why is the ulnar nerve moved instead of simply released?

Transposition can be chosen when the nerve is unstable, repeatedly snaps over the medial epicondyle, remains under tension, or requires revision after prior surgery.

Can hand weakness improve after ulnar nerve transposition?

Yes, but recovery depends on the severity and duration of nerve damage. Longstanding muscle wasting can improve slowly or remain permanent despite adequate decompression.

References

Ulnar Nerve Entrapment at the Elbow (Cubital Tunnel Syndrome). OrthoInfo, American Academy of Orthopaedic Surgeons. https://orthoinfo.aaos.org/en/diseases--conditions/ulnar-nerve-entrapment-at-the-elbow/. Date Accessed August 13, 2026.

Cubital Tunnel Release. OrthoInfo, American Academy of Orthopaedic Surgeons. https://orthoinfo.aaos.org/en/treatment/cubital-tunnel-release/. Date Accessed August 13, 2026.

Cubital Tunnel Syndrome: Signs & Treatment. American Society for Surgery of the Hand. https://www.assh.org/handcare/condition/cubital-tunnel-syndrome. Date Accessed August 13, 2026.

Decision-Making Factors for Ulnar Nerve Transposition in Cubital Tunnel Surgery. PubMed Central (PMC). https://pmc.ncbi.nlm.nih.gov/articles/PMC6443386/. Date Accessed August 13, 2026.

Rates of Complications and Secondary Surgeries After In Situ Cubital Tunnel Release Compared With Ulnar Nerve Transposition: A Retrospective Review. PubMed. https://pubmed.ncbi.nlm.nih.gov/28258868/. Date Accessed August 13, 2026.