STANDARD VALUES FOR THE MATURATION OF THE ILIAC BONE APOPHYSIS BY RISSER

Purpose: actualization of the standard values for the maturation of th e iliac bone apophysis by Risser. Methods: The study analysed retrospe ctively 515 data from 154 patients of german descent with idiopathic s coliosis. The study group included 312 X-rays of 82 female and 203 X-r ays of 72 male patients, born between 1970-1985 and within the age of 10 and 20 years at the time of the evaluation. The middle chronologica l age, the standard deviation, the difference between female and male patients as well as the t-value were calculated for each stage. In add ition the intervals with the corresponding t-values were calculated. R esults: The middle chronological age calculated for the stages of Riss er shows significant differences. Because of acceleration the ossifica tion begins earlier and finishes later. As assumed, the standard value s were different for female and male patients. Conclusion: The necessi ty of a new and complete investigation was given because of the accele ration of the maturation and the incomplete existing standard values. Clinical relevance: This study contains current standard values for ma turation of the iliac bone, which could be applied for analysing the s keletal maturation.