Classification of nerve injuries

Sunderlanda Seddonb Structure injured Prognosis
First degree Neurapraxia Schwann cell (demyelination) Complete recovery within 12 wk
Second degree Axonotmesis Axon (wallerian degeneration) Complete recovery regeneration 1 mm/day
Third degree Endoneurium Incomplete recovery
Fourth degree Perineurium No recovery
Fifth degree Neurotmesis Epineurium No recovery
Sixth degree Mixed injury, neuroma, incontinuity Unpredictable recovery

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