Introduction
Osteoarthritis (OA) is one of the most common types of
arthritis. A community survey in rural and urban parts of
India shows its prevalence to be 17–60.6 % (Sharma et al.
2007). OA is reported to affect 20 million people in US
alone and the number is expected to increase to 66–100 %
over the next two decades (Felson 2008).