Final answer:
Osteoarthritis is a noninflammatory joint disorder associated with aging and 'wear and tear' of the articular cartilage. It causes pain, swelling, and joint stiffness. Treatments focus on lifestyle changes, medication, and joint replacement surgery.
Step-by-step explanation:
Osteoarthritis is a noninflammatory joint disorder characterized by aging and "wear and tear" of the articular cartilage. It is the most common type of arthritis and is associated with factors such as injury to a joint, physical labor, sports activities, and being overweight. In osteoarthritis, the articular cartilage gradually becomes thinner, causing increased pressure on the bones and resulting in pain, swelling, and joint stiffness. Treatments for osteoarthritis focus on lifestyle changes, medication, and, in severe cases, joint replacement surgery.