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Doctors think two trends have contributed to that increase: the nation's obesity epidemic and amateur athletes who don't adjust workouts to spare aging or even injured joints. Both can lead to or worsen arthritis, the main reason for replacing knees. Donna Brent, 63, is in the latter category. The Deerfield, Ill., administrative assistant says decades of racket ball, tennis, softball and other sports took a toll on her knees, but she got used to living with the pain, even when she became bowlegged and developed a limp. When pain "started getting in the way of some of my sports," she gave in to her doctor's advice and had the operation last June on her right knee. She said she feels better than ever, is back to exercising and plans to resume tennis and softball when the weather warms up. During knee replacement operations, surgeons slice off a small portion of the worn-out surface on the ends of both leg bones that meet at the knee, then implant an artificial joint usually made of plastic or metal. Typical operations last about two hours, require a few days in the hospital, and cost roughly $40,000. Artificial knees generally last 15 to 20 years. While some are promoted as lasting 30 years, these estimates are generally based on use among older people more sedentary than baby boomers who expect new knees to let them be as active as they were before surgery. Sometimes that's possible, though doctors often discourage knee replacement patients from engaging in high-impact sports including jogging. The National Institute of Arthritis, Musculoskeletal and Skin Diseases paid for the study. ___ Online: Knee problems and replacements: American Academy of Orthopedic Surgeons:
http://1.usa.gov/xeWHqG
http://www.aaos.org/
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