Bone-growth stimulators are devices that send small electrical currents through the bones that need to heal. Research has consistently shown that electrical charges help stimulate bone growth. The electrical currents cause a chemical reaction that promotes healing.
There are three types of electrical stimulators. Direct current stimulation involves surgically placing a device right by the bones that need to be fused. Pulsed electromagnetic stimulators use two coils placed on the skin. Capacitative coupling uses two plates worn on the skin.