I Issue 3 Healthy joints, where the ends of bones meet, are cushioned by cartilage, a layer of smooth pliable tissue that allows the joint to move easily. The synovial membrane produces a fluid that reduces friction and wear in the joint.
Ligaments connect the bones and keep the joint stable.
Muscles and tendons power the joint and enable it to move. It occurs in more than half of adults aged 65 and older. Symptoms range from occasional stiffness and mild pain to severe joint pain and disability. In OA, the cartilage cushioning the bone ends gradually wears away. As bone rubs against bone, the joint loses shape and alignment.