Joint disease. Coloured computed tomography (CT) scan of a shoulder affected by arthrosis (yellow/red, also called degenerative joint disease or osteoarthrosis), frontal view. The upper arm bone (humerus, lower right) and shoulder blade (scapula, upper left) are seen, as well as the ribs (lower left). Arthrosis is a progressive condition causing damage to the cartilage and bones of a joint. It can affect many different joints in the body. Risk factors are obesity, aging and the menopause. Activities involving repetitive movements can also lead to arthrosis. Treatment is with anti-inflammatory drugs and, in severe cases, surgery.