RT @mitchelzoler: Total knee replacement surgeries in U.S. pts 45-64 yo soared from 68K to 221K during 1997-2007; reason unclear #OARSI2010
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RT @mitchelzoler: Total knee replacement surgeries in U.S. pts 45-64 yo soared from 68K to 221K during 1997-2007; reason unclear #OARSI2010