Osteoarthritis (OA) is one of our most common chronic joint disorders. The World Health Organization (WHO) has estimated that every second woman and every fourth man over the age of 60 suffer some form of OA. OA is most common in hands, knee, hip and back. OA is a rheumatic disorder which affects the whole joint and may start as early as in the age of 30. The main symptoms are pain, stiffness and decreased quality of life.