Nearly 1 in 20 US adults over 50 have fake knees (AP)

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In this Feb. 4, 2012 photo, Donna Brent, 63, works out her leg at her home in Deerfield, Ill. Brent 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 her sports, she gave in to her doctor's advice and had a knee replacement operation last June on her right knee. Nearly 1 in 20 Americans older than 50 have bionic knees, or more than 4 million people, according to the first national estimate showing how common these replacement joints have become in an aging population. (AP Photo/Nam Y. Huh)AP – Nearly 1 in 20 Americans older than 50 have artificial knees, or more than 4 million people, according to the first national estimate showing how common these replacement joints have become in an aging population.

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