Every step hurts when your knees stiffen and your muscles weaken at the same time. Osteoarthritis, meaning the gradual breakdown of joint cartilage, affects more than 32.5 million adults in the U.S. alone.
Every step hurts when your knees stiffen and your muscles weaken at the same time. Osteoarthritis, meaning the gradual breakdown of joint cartilage, affects more than 32.5 million adults in the U.S. alone.