The regrowth of muscle tissue to repair injured or damaged muscle fibers in the postnatal stage at the neuromuscular junction. Regeneration of neuromuscular junctions occurs in an orderly way and relies on communication between nerve and muscle. Skeletal myofibers regenerate after injury and form neuro-muscular junctions with motor axons similar to normal ones. Regenerating myofibers develop within the basal lamina sheaths (satellite cells) of original myofibers.