| Nerve Injury Classification | |||
| Sunderland | Seddon | Injury | Recovery Potential |
| I | Neuropraxia | Ionic block; possible segmental demyelinization |
Full |
| II | Axonotmesis | Axon severed; Endoneurial tube intact |
Full |
| III | Endoneurial tube torn | Slow; incomplete | |
| IV | Only epineurium intact | Neuroma-in-continuity | |
| V | Neurotmesis | Loss of Continuity | None |
| VI | Combination of above | Unpredictable | |