Myositis ossificans progressiva: a 10-year follow-up on a patient treated with etidronate disodium.

We describe a child who was treated for 10 years with etidronate disodium for myositis ossificans. There were no typical bouts of swelling, reddening or hardening of areas over the skeletal muscles with this treatment and there were no side effects. Nevertheless, a constant gradual progression of the disease led to severe limitation of joint movement. This is the first report on long-term treatment with etidronate disodium.