Brachial plexus root avulsion (BPRA), one of brachial plexus injuries, is considered to be a polytrauma associated with motorbikes (Faglioni, Siqueira, Martins, Heise, & Foroni, 2014), especially happen in young men of reproductive age (Giugale, Henrikson, Baronne, & Lee, 2015). In this traumatic condition, extensive motoneuron death in spinal cord, motor axon degeneration in musculocutaneous nerve, and de-innervation of targeted muscles were observed, leading to serious functional deficits in the upper limb (Hallin, Carlstedt, Nilsson-Remahl, & Risling, 1999). Although the injured axons can re-innervate the target muscle after surgical re-implantation of the avulsed ventral roots, the functional recovery is still disappointing (Fang et al., 2016). Several combinatorial strategies have been