Osteoporosis and osteoarthritis are different medical conditions, but similar names cause confusion. It's also possible for a person to have both.
Osteoporosis is a condition that weakens bones, leaving them fragile and more likely to fracture. It often affects the hips, spine, and wrists.
Osteoarthritis is when protective cartilage wears down between bones, leaving joints sore and stiff. It's the most common form of arthritis, often affecting the hips, hands, and knees.