How is a cut nerve treated?

A cleanly cut nerve is repaired microsurgically by aligning and suturing the nerve ends under magnification, ideally early and without tension. When a segment is missing or the ends cannot meet, the gap is bridged with a nerve graft or a synthetic conduit. Hand therapy and sensory re-education then support recovery as feeling returns.

Will the feeling come back?

Feeling often returns gradually after a well-aligned, early repair, but recovery is slow because the nerve must regrow from the repair site toward the fingertip. How much returns depends on the level and severity of the injury, the patient's age, and how promptly the repair was done.

How long does nerve recovery take?

Nerve fibers regrow slowly, so recovery is measured in months rather than weeks. Hand therapy during this time keeps the joints moving and prevents stiffness while sensation has not yet returned, which protects the final result.

Why does a cut nerve need surgery when a small cut might not?

A divided nerve will not reconnect on its own in a useful way; the ends must be brought back together precisely so the fibers can regrow across the repair. That is why a laceration causing numbness in a specific area should be evaluated promptly rather than simply bandaged.

Nerve Laceration, Steven J. Lee, MD

Nerves carry both sensation and the signals that move muscles. When a nerve is cut, often by glass, a knife, or a deep laceration, the skin it supplies goes numb and, depending on the nerve, certain muscles weaken. Unlike a cut tendon, a divided nerve does not simply hold still; the cut ends must be brought back together precisely so the fibers can regrow across the repair.

Outcomes depend on how cleanly the nerve was cut, where along its length the injury sits, the patient's age, and how soon a precise repair is performed. Recovery is gradual because the nerve must regrow from the repair site toward the fingertip.

What a cut nerve feels like

A complete nerve laceration produces numbness in a specific, mappable area of the hand and, for nerves that drive muscles, weakness or loss of certain movements. Many nerve injuries occur alongside cut tendons or blood vessels in the same wound, so the whole injury is evaluated together.

How it is evaluated

The diagnosis is usually clear from the mechanism, the wound, and a careful sensory and motor exam. In selected cases, nerve studies help map the injury or assess recovery over time. A wound that suggests a deep, sharp injury is explored so the nerve, and any associated tendon, can be repaired.

Dr. Lee's approach

Dr. Lee's priority with any sharp hand injury is to see the whole picture, the nerve, the tendons, and the blood supply, because these structures travel together and are often injured together. A clean nerve laceration is best repaired early, under magnification, with fine sutures that align the nerve ends without tension.

When a segment of nerve is missing or the ends cannot be brought together without tension, the gap is bridged with a nerve graft or a nerve conduit. Recovery is then guided by hand therapy and sensory re-education as feeling returns.

Microsurgical repair

A clean, sharply cut nerve is repaired by precisely aligning and suturing the ends under magnification (a direct repair). Done early and without tension, this gives the regrowing fibers the best path to follow.

Nerve graft or conduit

When the ends cannot meet without tension, or a segment is missing, the gap is reconstructed with a nerve graft or a synthetic conduit so the fibers have a scaffold to regrow across.

Recovery timeline

Nerve recovery is gradual and follows the regrowth of the nerve fibers:

Early
The repair or graft is protected, often with a splint, while the coaptation heals. Any associated tendon repair is rehabilitated on its own protected schedule.
Weeks to months
The nerve regrows slowly from the repair toward the fingertip. Hand therapy maintains motion and prevents stiffness while feeling has not yet returned.
Months and beyond
Sensation returns gradually, supported by sensory re-education. Final recovery can take many months and depends on the level and severity of the injury.

What patients commonly misunderstand

What patients often misunderstand:

A numb finger after a cut is not minor. Numbness in a defined area after a laceration can mean the nerve was divided. Early evaluation matters, because a clean nerve repaired promptly does far better than one addressed late.
Recovery is slow by nature. Even a perfect repair recovers gradually, because the nerve has to regrow from the repair site. Patience and hand therapy are part of the treatment, not a sign that something is wrong.

This page is general educational content authored by Dr. Lee. It is not a substitute for individual medical advice. Every patient's case is different, book a consultation to discuss yours.

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Nerve Laceration: microsurgical repair to restore feeling and function.