Epidemiology of Osteoarthritis

Osteoarthritis (OA) is the most common joint disorder in the United States [1]. Symptomatic disease in the knee and hip occurs in approximately 6% and 3%, respectively, of adults 30 years of age or older [2]. From 1995 to 2005, the number people affected with symptomatic OA has grown from 21 million to nearly 27 million in the United States, probably reflecting the aging of the population and the obesity epidemic [3]