This 2000 narrative review by Lee and Wolfe synthesizes peripheral nerve anatomy, injury classification, and surgical management. It addresses how to classify injuries using the Seddon and Sunderland systems, when and how to repair them, and what predicts functional recovery. The paper also surveys emerging adjunctive strategies including pharmacologic agents, immune modulators, and entubulation chambers.
Every peripheral nerve injury needs a classification before it needs a plan.
A Sunderland type 2 injury (axons disrupted, all connective tissue intact) warrants watchful waiting — full recovery is expected. A type 4 (only epineurium intact) will not recover spontaneously and requires surgical excision and reconstruction. Fluency in the Seddon-Sunderland mapping is a core board and clinical competency.
When counseling a patient before nerve repair, apply the four prognostic factors directly: age over 54, injury above the elbow, anticipated graft over 7 cm, or delay beyond 23 months each predict a poor result. Even with optimal microsurgical technique, roughly half of patients will not regain useful function.
Time pressure is real. The motor endplate window closes at approximately 12 months after denervation. Nerve reconstruction cannot wait indefinitely. Grafts should be cut 10-20% longer than the measured gap to account for inevitable shortening, and the sural nerve remains the standard autograft donor.
This 2000 narrative review by Lee and Wolfe synthesizes peripheral nerve anatomy, injury classification, and surgical management. It addresses how to classify injuries using the Seddon and Sunderland systems, when and how to repair them, and what predicts functional recovery. The paper also surveys emerging adjunctive strategies including pharmacologic agents, immune modulators, and entubulation chambers.
Every peripheral nerve injury needs a classification before it needs a plan.
A Sunderland type 2 injury (axons disrupted, all connective tissue intact) warrants watchful waiting — full recovery is expected. A type 4 (only epineurium intact) will not recover spontaneously and requires surgical excision and reconstruction. Fluency in the Seddon-Sunderland mapping is a core board and clinical competency.
When counseling a patient before nerve repair, apply the four prognostic factors directly: age over 54, injury above the elbow, anticipated graft over 7 cm, or delay beyond 23 months each predict a poor result. Even with optimal microsurgical technique, roughly half of patients will not regain useful function.
Time pressure is real. The motor endplate window closes at approximately 12 months after denervation. Nerve reconstruction cannot wait indefinitely. Grafts should be cut 10-20% longer than the measured gap to account for inevitable shortening, and the sural nerve remains the standard autograft donor.