Table 1 Clinical background of the operated children

I.

10 months

brachial plexus exploration, reconstruction of the upper and middle trunk, neurolysis of the lower trunk.

3 years

extraplexic neurotisation SAN to ulnar nerve, without success

II.

3 months

Normal MRI, EMG shows only reinnervation of arm muscles, no recovery within forearm and hand.

13 months

MyeloCT: suspicion of root avulsions C6 C8 Th1

III.

no previous surgery

IV.

14 months:

MyeloCT: suspicion of root avulsion C7 C8

EMG: no activity C6 C7 C8 Th1

28 months:

plexus exploration, only neurolysis C5