Two grading systems are used to define the extent of the nerve injury; Seddon’s and Sunderland’s. Seddon’s classification includes neurapraxia, axonotmesis, and neurotmesis in the order of increasing severity. Sunderland’s classification has five grades of nerve injury. Seddon’s classification is the classification of nerve injuries that most physicians use. Nerve injury is classified by Seddon into three types: neurapraxia, axonotmesis, and neurotmesis.

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