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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.
Surface Finish Definitions: 1  Ra: Ra is the arithmetic average of the absolute values of the roughness profile ordinates. 2  Also known as Arithmetic Average (AA), Center Line Average (CLA). Rz is the arithmetic mean value of the single roughness depths of consecutive sampling lengths. 2  Z is the sum of the height of the highest peaks and the lowest valley depth within a sampling length. 3  c: of a profile filter determines which wavelengths belong to roughness and which ones to waviness.