OA or the degenerative joint diseases, is the most common type of arthritis(also known as synovial disease).OA is a chronic condition characterized by the breakdown of the joints cartilage. The breakdown of the cartilage causes the bones to rub against each other ,causing stiffness, pain and loss of movement of the joint. It is associated with again and most typically begins among people aged 50 years or older. A young person develops OA ,typically has had an injury to the knee or may have other pathological conditions.