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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.
The stages are Risser I through Risser V, where Risser V denotes that the apophysis has completely fused with the iliac crest and therefore skeletal maturity can be assumed. Rissers Sign-evaluation of the iliac apophysis. Closure of the iliac crest apophysis occurs from anterior (zone 1) to posterior (zone 4).