More than 500 million people around the world live with osteoarthritis. The knee is affected more often than any other joint, with symptoms (such as pain, stiffness and reduced movement) affecting work, sleep, sport and daily activities.
Knee osteoarthritis is often thought of as thinning of the protective layer of cartilage within the joint. But we now understand it affects all the structures of the joint, including the bones, muscles and nerve endings.
