Effects of exosomes from mesenchymal stem cells on functional recovery of a patient with total radial nerve injury: A pilot study

Table 1 Classification of sensory recovery according to the Mackinnon-Dellon scale

Grade	Recovery of sensibility
S0	Poor: No recovery of sensibility
S1	Poor: Recovery of deep cutaneous pain sensibility
S1+	Poor: Recovery of superficial pain sensibility
S2	Poor: Recovery of superficial pain and some touch sensibility
S2+	Poor: As in S2, but with overresponse
S3	Poor: Recovery of pain and touch sense with no overresponse (> 15 mm s2PD, > 7 mm m2PD)
S3+	Good: As S3, but localization of stimulus is good and imperfect recovery of 2PD (7-15 mm s2PD, 4-7 mm m2PD)
S4	Excellent: Complete recovery (2-6 mm s2PD, 2-3 mm m2PD)

The Mackinnon-Dellon scale is a tool used to assess sensory function after the repair of peripheral nerve injuries. This scale is used to evaluate the degree of sensory recovery in patients who have undergone nerve repair surgery. The scale ranges from S0 to S4, with S0 indicating no sensation and S4 indicating normal sensation. s2PD: Static sense of two-point discrimination; m2PD: Motor sense of two-point discrimination.