Question:
A patient has an ulnar nerve injury with an intervening gap (ICM gap). What is the best treatment to restore nerve continuity?
A patient has an ulnar nerve injury with an intervening gap (ICM gap). What is the best treatment to restore nerve continuity?
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Tension is the greatest enemy of nerve healing.
Always choose a nerve graft over a tight primary repair when a segmental gap is present.
Always choose a nerve graft over a tight primary repair when a segmental gap is present.
Updated On: Sep 3, 2026
- Nerve graft
- Primary repair
- Nerve transfer
- Tendon transfer
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The Correct Option is A
Solution and Explanation
Concept:
The clinical scenario involves a peripheral nerve injury characterized by an anatomical gap (loss of nerve substance) between the proximal and distal stumps.
The objective is to identify the most biologically appropriate surgical technique to bridge this physical defect and restore axonal continuity.
Explanation:
• A fundamental principle of peripheral nerve microsurgery is that all repairs must be completely tension-free.
• If a primary end-to-end repair is forced under tension to close an intervening gap, it will cause severe vascular compromise to the vasa nervorum, leading to ischemia, fibrosis, and total failure of axonal regeneration.
• When the gap cannot be overcome by simple nerve mobilization or postural joint positioning, bridging the defect with a nerve autograft is the absolute gold standard.
• A nerve graft (most commonly utilizing the sural nerve) acts as a structural scaffold, providing endoneurial tubes through which the regenerating axons can grow from the proximal stump to the distal stump without tension.
• Nerve transfers are generally reserved for very proximal injuries (e.g., brachial plexus root avulsions) where the distance to the target muscle is too great, or when the proximal stump is entirely unavailable.
• Tendon transfers are salvage procedures aimed at restoring motor function after nerve regeneration has failed or is deemed impossible, but they do not restore actual nerve continuity.
Final Answer:
A nerve graft is the best and standard treatment to bridge an anatomical gap and restore continuity in an injured peripheral nerve.
The clinical scenario involves a peripheral nerve injury characterized by an anatomical gap (loss of nerve substance) between the proximal and distal stumps.
The objective is to identify the most biologically appropriate surgical technique to bridge this physical defect and restore axonal continuity.
Explanation:
• A fundamental principle of peripheral nerve microsurgery is that all repairs must be completely tension-free.
• If a primary end-to-end repair is forced under tension to close an intervening gap, it will cause severe vascular compromise to the vasa nervorum, leading to ischemia, fibrosis, and total failure of axonal regeneration.
• When the gap cannot be overcome by simple nerve mobilization or postural joint positioning, bridging the defect with a nerve autograft is the absolute gold standard.
• A nerve graft (most commonly utilizing the sural nerve) acts as a structural scaffold, providing endoneurial tubes through which the regenerating axons can grow from the proximal stump to the distal stump without tension.
• Nerve transfers are generally reserved for very proximal injuries (e.g., brachial plexus root avulsions) where the distance to the target muscle is too great, or when the proximal stump is entirely unavailable.
• Tendon transfers are salvage procedures aimed at restoring motor function after nerve regeneration has failed or is deemed impossible, but they do not restore actual nerve continuity.
Final Answer:
A nerve graft is the best and standard treatment to bridge an anatomical gap and restore continuity in an injured peripheral nerve.
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