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Progressive ultrastructural changes after peripheral nerve transection and repair

H E Cabaud, W G Rodkey, T J Nemeth

    The Journal of Hand Surgery
    |July 1, 1982
    PubMed
    Summary
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    Rapid nerve repair in monkeys aids reinnervation. Regenerating nerve fibers often form new pathways, not using old ones, highlighting the importance of timely ulnar nerve repair for functional recovery.

    Area of Science:

    • Neuroscience
    • Regenerative Medicine
    • Surgical Repair

    Background:

    • Understanding nerve regeneration is crucial for treating peripheral nerve injuries.
    • The role of existing endoneurial tubules in guiding regenerating axons after nerve repair is debated.

    Purpose of the Study:

    • To investigate the sequential events of reinnervation following ulnar nerve repair in rhesus monkeys.
    • To determine the pathways utilized by regenerating neurites distal to the site of nerve transection and repair.

    Main Methods:

    • Sharp transection and repair of intrinsic motor fascicles of the ulnar nerves in six rhesus monkeys.
    • Light and electron microscopy of nerve sections at 2.0 mm increments distal to the neurorrhaphy, analyzed weekly.
    • Observation of neurite sprout formation and pathway utilization.

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    Main Results:

    • Neurite sprouts were identified distal to the neurorrhaphy by one week and 40 mm distal by three weeks.
    • Regenerating neurites, both myelinated and unmyelinated, predominantly utilized new endoneurial tubules.
    • Existing endoneurial tubules were less frequently used as conduits for regenerating axons than previously suggested.

    Conclusions:

    • Regenerating ulnar nerve fibers in rhesus monkeys often form new pathways, potentially limiting perfect end-organ specificity.
    • Immediate repair of transected nerves is clinically implied to facilitate rapid neurite crossing and reinnervation.
    • The study underscores the importance of timely surgical intervention for optimal nerve regeneration outcomes.