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.

Table 2 The British Medical Research Council scale

Grade	Recovery level	Muscle strength
M0	Failure	No contraction
M1	Poor	Return of perceptible contraction in the proximal muscle group
M2	Fair	Return of perceptible contraction in both proximal and distal muscles; the extensor carpi radialis muscles may contract against force, but absence or trace of wrist extension
M3	Moderate	Wrist extension against gravity to the neutral position; absence or trace of finger or thumb extension
M4	Good	Wrist extension against force; trace or better finger and thumb extension
M5	Excellent	Wrist, finger, and thumb extensors restored close to normal

The British Medical Research Council scale is a tool used to assess muscle power in patients with peripheral nerve injuries. The scale grades muscle power on a scale of M0 to M5 in relation to the maximum expected for that muscle. Motor recovery grading following the recovery of radial nerve for a proximal forearm radial nerve lesion, extensor carpi radialis longus and brevis are the proximal muscles, and the extensor communis and extensor pollicis longus are the distal muscles.