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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.
Iliac Apophysis-Risser's Sign. In general the long bone growth plates close at 15 to 17 years in males and 13 to 15 years of age in females.