Osteoarthritis affects the synovial joint. Synovial joints are present in joints where a wide range of movement is possible. The synovial joint is where a portion of the bone is coated with articular cartilage and lubricated with synovial fluid. In osteoarthritis there is a focal loss of this articular cartilage with proliferation of new bone and remodeling of the joint contour. Synovial joints include wrists, knees, ankles, shoulders, and hips.