A number of semiquantitative scoring methods for grading cartilage loss on MRI have been developed. Most of these scoring strategies derive from arthroscopy, and grade primarily the depth of focal cartilage loss over a five-point scale. However, newer scores have been developed, which aim at grading osteoarthritis and provide a more complex analysis of cartilage. These include the Whole-Organ MRI score (WORMS) and the Boston–Leeds Osteoarthritis Knee score (BLOKS), in addition to cartilage these scores also grade other tissues involved in osteoarthritis such as bone marrow, menisci, and ligaments.