Degenerative disorder of joint is the most common articular pathology in the elderly, receiving growing attention in recent years because of the remarkable prolongation of life expectancy. There are various terms to describe the disorder, including osteoarthritis, osteoarthrosis, degenerative arthritis, and degenerative joint disease. A number of factors have been implicated as causative, but the mechanical wearing down of the articular cartilage and supportive structures due to aging and obesity appear to be responsible. According to Mitchel and Cruess (1977) osteoarthritis may result from either an abnormal concentration of stress across a normal joint or a normal concentration of stress across an abnormal joint with an altered cartilage or subchondral bone.