We know that more than 1 million total hip and total knee replacements are performed each year in the US. But how many people are actually walking around right now with such prostheses?

That’s the question Kremers et al. answer in the September 2, 2015 edition of The Journal of Bone & Joint Surgery. Using the so-called “counting method” to combine historical incidence data, these Mayo Clinic authors concluded that about 7 million US residents (slightly more than 2% ) were living with a hip or knee replacement in 2010.

Prevalence of hip replacement was 0.83%, while that of knee replacement was 1.52%.

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