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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.
Also found in: Dictionary, Thesaurus, Legal, Financial, Encyclopedia, Wikipedia. Rinne test. a tuning fork test that compares the duration of perception by bone conduction and by air conduction. In the normal ear, the fork is heard twice as long by air conduction as by bone conduction. Rinne test: A, Normal: sound is heard twice as long by air conduction (AC) as by bone conduction (BC); a âpositiveâ Rinne, or AC &gt; BC. B, Conductive loss: person hears as long by bone conduction (AC = BC) or even longer (AC &lt; BC), a ânegativeâ finding on the Rinne test.