According to the National Center for Health Statistics, close to 330,000 hip replacements are performed each year in the U.S. Many are done to ease the pain of osteoarthritis, also called wear and tear arthritis. And most patients are over age 60. But that's' changing, as younger patients are opting for surgery so they can stay active. Experts at Mayo Clinic say an alternative approach to standard hip replacement helps stop the pain and gets many people back to their normal activities faster.