Prognosis following severe trauma to nerves in the upper arm and forearm, if left untreated, is extremely poor. Current conventional treatment is through primary nerve repair and by inserting a nerve graft (most commonly using the sural nerve) to restore nerve continuity. However, even with that, the extent of reinnervation is often far from complete. The glacial rate of nerve regeneration, at no more than 1 mm a day, can easily leave the target intrinsic hand muscles deprived of nerve innervation for a year or more. The long period of denervation, coupled with a lack of active movements can lead a whole host of negative consequences including muscle fibre fibrosis, contracture, secondary joint derangement and not infrequently, pain. Equally important is the Schwann cells' ability to support trophic support and nerve growth guidance also gradually declines. Therefore, a more effective treatment is urgently needed. A recent approach is by doing a distal nerve transfers. That shortens the distance of reinnervation greatly. However, the outcome following this transfer or with primary suture repair following acute median or ulnar nerve laceration is relatively poor. Another closely related common trauma to the hand is laceration of digital nerves where recovery of sensory functions following primary nerve suture is equally poor. To potentially further expedite the reinnervation, the investigators proposed to additionally stimulate the proximal nerve stump immediately following the nerve transfer and/or the nerve repair. Whether this novel approach will indeed further expedite the reinnervation and improve hand function following nerve laceration is not known at this point. This will be the first human application study to address that question.