Osteoarthritis What is osteoarthritis (OA)? Osteoarthritis (OA) is a condition that affects the joints. In a normal joint, the ends of the bones are covered by a layer of cartilage. Cartilage helps the joint move smoothly and cushions the ends of the bones. In OA, the cartilage breaks down and becomes thin. This leaves the ends of the bones unprotected, and the joint loses its ability to move smoothly. OA mainly affects people over the age of 45, but it can develop in younger people. For more information about osteoarthritis including:- What is osteoarthritis (OA)? What are the symptoms? What causes it? How is it diagnosed? What will happen to me? Is there a cure for OA? What are the treatments for OA? What can I do? Contact the Arthritis Helpline on 1800 011 041 to request your copy or download these resources for further reading: Osteoarthritis Taking Control of Your Osteoarthritis Medicines and Arthritis Working with Your Healthcare Team Dealing with Pain Healthy Eating and Arthritis Physical Activity Arthritis and Emotions Saving Energy