The incidence of knee osteoarthritis has nearly doubled in the United States since the mid-1900s. The obvious explanation is a longer lifespan and greater body weight (BMI).
Researchers found that 1% of people living from the 1800s to the mid-1900s were obese, versus 42% of people today.
The more you weigh, the greater the pressure on your knees.
–1.5 times your body weight when walking on level ground
–2-3 times your body weight when going up or down stairs
–4-5 times your body weight when squatting
A 150 pound woman squatting down to pick up something from the floor is putting up to 750 pounds of pressure on her knees.
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