Synovitis. Arthroscope (endoscope) view of a knee with synovitis,inflammation of the synovium (synovial membrane) that lines the joint capsule,due to osteoarthritis. Osteoarthritis is joint inflammation due to the loss of its friction- reducing cartilage. Osteoarthritis,along with other forms of arthritis,is a major cause of synovitis. In synovitis,the inflamed synovium secretes too much lubricating fluid into the capsule that encloses the joint,causing pain and swelling. Treatment is with rest,joint support,painkillers,anti-inflammatory drugs or,in severe cases,through the surgical removal of the synovium |