M Saul
You can call the arthritis association and they will provide a very informative brochure on polymyalgia rheumatica - it will answer all your questions. The cortisone is not curing the disease; however, it is NECESSARY that it be taken to ensure that the disease does not progress and to relieve the pain. His dosage will be reduced gradually over time until a maintenance dose is determined. The disease "burns itself out" in three to five years; however, I know of people who have had it longer.