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Nearly 1 in 20 Americans older than 50 have artificial knees, or more than 4 million people, according to the first national estimate showing how common these replacement joints have become in an aging population.

Nearly 1 in 20 Americans older than 50 have artificial knees, or more than 4 million people, according to the first national estimate showing how common these replacement joints have become in an aging population.
We're becoming a nation of bum knees, worn-out hips and sore shoulders, and it's not just the Medicare set. Baby boomer bones and joints also are taking a pounding, spawning a boom in operations to fix them.
We're becoming a nation of bum knees, worn-out hips and sore shoulders, and it's not just the Medicare set. Baby boomer bones and joints also are taking a pounding, spawning a boom in operations to fix them.
Replacement joints can greatly improve quality of life for people with worn-out knees, but they're not risk-free and it's a major operation that people should not take lightly, she said.
Replacement joints can greatly improve quality of life for people with worn-out knees, but they're not risk-free and it's a major operation that people should not take lightly, she said.