Pulsed electromagnetic field therapy (PEMFT), also called pulsed magnetic therapy, pulse magneto therapy, or PEMF, is a reparative technique most commonly used in the field of orthopedics for the treatment of non-union fractures, failed fusions, congenital pseudarthrosis and depression. In the case of bone healing, PEMF uses directed pulsed magnetic fields through injured tissue. This is believed to stimulate cellular repair. The FDA has approved several such stimulation devices. These devices provide a complementary solution that may aid in bone repair. Although electromagnetic therapy became widely adopted in Western Europe, its use was restricted to animals in North America. Veterinarians became the first health professionals to use PEMF therapy, usually to heal broken legs in racehorses. Professional sports doctors then decided to experiment with veterinarian devices off label on professional athletes which ultimately led to legally licensed devices for human use in the United States - but under strict stipulations that it was only to be used for non-union bone fractures under a medical prescription from a licensed doctor.