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The Risser sign refers to the amount of calcification of the human pelvis as a measure of maturity. On a scale of 5, it gives a measure of progression of ossification; the grade of 5 means that skeletal maturity is reached. Risser sign is based on the observation of an X-ray image. Grade 1 is given when the ilium (bone) is calcified at a level of 25%; it corresponds to prepuberty or early puberty. Grade 2 is given when the ilium (bone) is calcified at a level of 50%; it corresponds to the stage before or during growth spurt. Grade 3 is given when the ilium (bone) is calcified at a level of 75%; it corresponds to the slowing of growth. Grade 4 is given when the ilium (bone) is calcified at a level of 100%; it corresponds to an almost cessation of growth. Grade 5 is given when the ilium (bone) is calcified at a level of 100% and the iliac apophysis is fused to iliac crest; it corresponds to the end of growth. The Risser sign is referenced in clinical decision-making regarding adolescent idiopathic scoliosis. The earlier the Risser Grade, the greater the likelihood of a scoliosis progressing to the point it becomes clinically significant and requires intervention.〔http://www.aafp.org/afp/2002/0501/p1817.html〕 ==References== Greulich WW, Pyle SI: Radiographic Atlas of Skeletal Development of the Hand and Wrist, 2nd edition. Stanford, . CA: Stanford University Press, 1959. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Risser sign」の詳細全文を読む スポンサード リンク
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