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The different grades of the Risser sign give a measure of bone maturity and thus of the skeletal growth to be expected. In Europe, a scale ranging from Risser 0 to Risser 5 defines the grades from beginning ossification to complete fusion of the apophysis to the iliac bone. In the USA, 4 grades are defined.
Dr. Riew is the Mildred B. Simon Professor of Orthopedic Surgery at Washington University in St. Louis. He is also a professor of neurological surgery, the chief of the Surgical Spine Center, and director of the Cervical Spine Institute. Dr. Riew is a former president of the CSRS.