In 2010, almost 700,000 people over the age of 45 had total knee replacements (according to the Centers for Disease Control), making it the most frequently performed inpatient procedure in this age group. In the decade from 2000 to 2010, the total number of knee replacements (arthroplasties) was more than 5 million, with 98.1% of all surgeries performed on people 45 years of age or older. […]