Lifetime Probability of Total Knee Replacement
~7%
Lifetime probability in US
About 7% of Americans will undergo total knee replacement during their lifetime, with about 790,000 procedures performed annually.
Total knee replacement (arthroplasty) is one of the most successful and common orthopedic procedures, with approximately 790,000 performed annually in the United States. The lifetime risk of undergoing knee replacement is about 7% overall, but increases significantly for those with osteoarthritis, obesity, or prior knee injuries.
The primary indication for knee replacement is severe osteoarthritis causing pain, stiffness, and functional limitation that has not responded to conservative treatments. The average age at surgery is about 66, though procedures in younger patients (under 60) have increased significantly. Women are about 1.5 times more likely than men to undergo knee replacement.
Modern knee replacement implants have a survival rate of about 90-95% at 15-20 years. The surgery has one of the highest patient satisfaction rates of any surgical procedure, with about 85-90% of patients reporting significant pain relief and improved function. Recovery typically involves 6-12 weeks of physical therapy, with most patients returning to normal activities within 3-6 months. Complications are relatively rare but include blood clots (about 1-2%), infection (about 1%), stiffness, and implant loosening. Robotic-assisted and computer-navigated techniques are increasingly used to improve implant positioning and outcomes.
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