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Common classification systems relating to peripheral nerve injuries.
| Sunderland [37] | Seddon [75] | injury | recovery potential |
|---|---|---|---|
| I | neuropraxia | ionic block; possible segmental demyelinization | full |
| II | axonotmesis | axon-severed, endoneural tube intact | full |
| III | endoneural tube torn | slow, incomplete | |
| IV | only epineurium intact | neuroma-in-continuity | |
| V | neurotmesis | loss of continuity | none |
| VI | combination of above |
