Table 3.

Sensory Nerve Recovery Grading Modified by Mackinnon and Dellon

Grade		Group I	Group II
S0:	Absence of sensibility in the autonomous zone of the nerve
S1:	Recovery of deep cutaneous pain sensibility within the autonomous zone of the nerve
S2:	Partial recovery of superficial pain and tactile sensibility within the autonomous area of the nerve	n=1	n=3
S3:	Recovery of superficial cutaneous pain and tactile sensibility throughout the autonomous area without hyperalgesia. S2PD >15 mm, M2PD >7 mm	n=3	n=3
S3+:	Recover to S3 level, and some recovery of two point’s discrimination. S2PD: 7–15 mm, M2PD: 4–7 mm	n=3	n=4
S4:	Complete recovery. S2PD: 2–6 mm, M2PD: 2–3 mm	n=4	n=1

Abbreviations: M2PD, moving two-point discrimination; S2PD, static two-point discrimination.