group 2:T1 nerve root rhizotomy operation + rehabilitation therapy

A multi-center clinical study on the reconstruction of finger extensor function by transposition of the phrenic nerve to repair the posterior division of the lower trunk

A multi-center clinical study on the reconstruction of finger extensor function by transposition of the supinator branch to repair the posterior interosseous nerve

A multi-center clinical study on the reconstruction of finger extensor function by transposition of the accessory/intercostal nerve combined with free gracilis transplantation