Osteoarthritis (OA) is the most common chronic condition and a leading cause of disability among older adults. Studies indicate there are important racial and ethnic differences in the prevalence of OA, as well as in the associated outcomes and medical care. In general, research suggests some minority groups, especially African-American and Hispanic individuals, may be at risk for poorer outcomes (such as pain and disability), and are less likely to undergo arthroplasty, compared to Caucasian Americans. Racial and ethnic differences in OA and its medical care are poorly understood. Research is needed to examine biological, psychosocial, and lifestyle factors that may contribute to these disparities.