Introduced early into the course of PTOA, electromagnetic energy may have the benefit of maintaining function in highly active individuals. Thus, electromagnetic fields are particularly suited to young active populations and for the military, in whom, PTOA is an unfitting condition and for whom joint replacement is an unsuitable salvage option. If successful, electromagnetic energy will maintain joint function and avoid surgery. The benefits to retain ones own joint are obvious. Electromagnetic energy devices are FDA approved for bone healing and have been use for 30 years in thousands of patients with an extremely low frequency of adverse events. So the risks of treatment are quite minimal. The clinical applications of electromagnetic field therapy would especially appealing to the young and middle aged patients with early PTOA who are symptomatic from pain and limited function. Benefits would be the reduction of pain and inflammation with concomitant improved function and also preservation of cartilage and bone with the potential avoidance, or at least delay, of joint replacement. Risks of this treatment would be so infrequent as to be anecdotal.