Over 4 million Americans have fake knees

According to the first national estimate on replacement joints, over 4 million people have artificial knees.
That is nearly one in every 20 Americans older than 50.
Though doctors know that numbers of knee replacements have increased in the past decade, they haven?t yet had a final estimate, said a recent Seattle Times article. According to Dr. [...]

Source: http://blog.su-spectator.com/2012/02/over-4-million-americans-have-fake-knees/

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