Yes, pulse magnetic therapy is used all over the world to heal bones which won't knit together under plaster. Many physiotherapists also use magnets. The sort of magnets that are available to buy are for things like headaches and arthritis. You can find them at http://www.magnetictherapy.co.uk
and www.norstarbiomagnetics.com and www.magna-health.com. If, however, you need a therapist for something more serious, contact The British Biomagnetic Association on 01803 293346.