Knee numbers

300,000 knee replacements were performed in 2003 in the United States, and that number is expected to rise dramatically as baby boomers hit their 60s and 70s.The rate of Americans older than 65 being hospitalized for knee replacements has increased by 90 percent between 1992 and 2004.The rate of total knee replacements has more than doubled between 1995 and 2005, from 10.6 to 21.9 knee replacements per 10,000 peopleSource: National Center for Health Statistics