Osteoarthritis also known as wear and tear disease of the joints, is the most common type of arthritis. In osteoarthritis the protective cartilage inside your joints wears away, causing your bones to rub together and your joints to swell. osteoarthritis affects mainly weight bearing joints like knee, hip. Common symptoms of osteoarthritis include joint soreness, morning stiffness, pain and inability to move through a full range of motion. Age, genetics, excess body weight, injury or overuse of the joint are the main causes of osteoarthritis.