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Plagued by dull creaking and stiffness in your knees every time you bend down or climb the stairs? Chances are you’ve got knee osteoarthritis, a top cause of knee pain when bending. And you’re not alone. “Some studies show that 1 in 4 individuals over the age of 45 have some level of arthritic changes in their knee already,” says James Chen, MD, an orthopedic surgeon at DISC Sports & Spine Center in Newport Beach, CA, and a member of the California Orthopedic Association.