Standard RUS skeletal maturation of Tokyo children

Abstract

A total of 704 girls and 753 boys, all healthy, from 3 to 18 years of age, from Tokyo and its suburbs, were radiographed on the left hand and wrist in 1986. Their RUS (TW2) skeletal maturity was estimated, the 50th-centile skeletal maturity scores were obtained, and the smoothed RUS maturity curves were determined applying the cubic spline function to the 50th-centile scores. On this maturity curve the score at each 0.1 year of chronological age was obtained and allocated as a given RUS skeletal age. This set of scores and ages we termed the TW2-J RUS, i.e. the Japanese TW2 RUS maturity standard. Comparing this RUS standard with the British standard, the Belgian, the southern Chinese, and the northern Indian, it became clear that Japanese children's RUS skeletal maturity progresses rapidly during puberty (after ages 9 in girls and 11 in boys), and that the maximum score difference between neighbouring age groups was observed at ages 12.5 in girls and 14.5 in boys on the spline-smoothed curve. Japanese children attain the adult stage 1 or 2 years earlier than other groups of children (at ages 15 in girls and 16 in boys).

The Bias toward Biological Maturation through the Talent Selection in Japanese Elite Youth Soccer Players

“…Atˆrst, we investigated the discrepancy of assessment of skeletal age between TW3 and Japanese standardized procedure (J-SA), because maturation pattern of Japanese children and European children is not homogeneous (Ashizawa, et al, 1996). Our nding indicated that the trend in evaluated value of skeletal age using J-SA and TW3 was similar.…”

“…However, there was still diŠer-ence in evaluated skeletal age between two procedures, ie; TW3 determined the skeletal maturation as``late'' compared to that of J-SA in younger age group. Ashizawa et al (1996) reported that the RUS score of Japanese children were lower than that of the European (British and Belgium) standard score until 11.5 years old. Then the Japanese skeletal maturation exceeded drastically the standard score.…”

“…Since the Japanese is not the exception of these (Ashizawa et al, 1996;Murata, 1997;Takai, 1990), Murata and colleagues proposed the Japanese standardized skeletal age based on the Tanner-Whitehouse method (Murata et al, 1993(Murata et al, , 1997. Therefore, we should investigate the characteristics of skeletal maturity in Japanese adolescent soccer players using J-SA.…”

“…In the case of Japanese children, Radius-Ulna-Short bone (RUS) score of Tanner-Whitehouse (TW) 2 method tended to be lower than those of standard score in younger age (under twelve years of age) and exceeds in older age. Finally, RUS score reached adult value in one or two years earlier than that of European children (Ashizawa et al, 1996). In brief, using the TW2-SA lead us an under/over-estimation of skeletal maturity in Japanese adolescents during pre/mid-puberty comparing to those of TW2 standard.…”

Métodos baseados em Atlas ou TW3? Estimativa da idade óssea em brasileiros

“…16 Quando se emprega o método TW, as idades ósseas estimadas são muitas vezes maiores que a IC, o que tem sido observado em argentinos 17 , italianos 18 e japoneses. 19 Em relação ao AV, se desconhece se o mesmo tem sido aplicado em outras populações para verificar sua aplicabilidade.…”