Seddon-Sunderland Nerve Injury Classification
Seddon-Sunderland peripheral nerve-injury classification.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Sunderland grade
- Grade IV — perineurium disrupted (neuroma-in-continuity)
Result: Sunderland grade IV: perineurium disrupted (neuroma-in-continuity); surgical repair typically required.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- I
- Neurapraxia: myelin/conduction block, structures intact; complete recovery in days to weeks.
- II
- Axonotmesis: axon disrupted, endoneurium intact; good spontaneous recovery by axonal regrowth.
- III
- Axonotmesis: endoneurium also disrupted; slower, variable/incomplete recovery.
- IV
- Perineurium disrupted (neuroma-in-continuity); little spontaneous recovery — surgery usually required.
- V
- Neurotmesis: complete transection; no spontaneous recovery — surgical repair required.
What you enter
- Sunderland grade
How this is calculated
Sunderland S. A classification of peripheral nerve injuries producing loss of function. Brain. 1951;74(4):491-516. (Five degrees; Seddon HJ. Three types of nerve injury. Brain. 1943;66(4):237-288.) Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.