| Objective:Skeletal age is the best indicator of reflecting the maturity of bone development of the youth which is more accurately than the age of reflecting developmental maturity. The aim of the study is understanding the development of post-modern youth and young women's hand wrist skeletal the degree of development through interpretation of adolescent and youth development the latter part of the Ministry of Women's hand wrist skeletal using bone age evaluation method and quantitative analysis of the late puberty dry completely healed to the epiphyseal line epiphyseal disappear at the same time in order to extend the latter part of bone age of puberty judged to provide reliable data and information. At the same time this study try to find a method of assessing skeletal age of postpuberty stage for sports fields, in order to provide a reliable basis for the division of large age group athletesMethods:Through random selection in Beijing in early high school girls aged 13-21years, a total of 765people. According to birthday calculating the chronological age (such as the 13-year-old group was 13.1-13.9 years), each year as a group before 15years old and 16-20yr divided into 10 groups on half of year. Shooting the anteroposterior X-ray of the hand-wrist with both hands, without any physical chronic and hereditary, fractures and other diseases, shooting both hands of digital X-rays.Traditional shooting hand wrist skeletal department 14-inch and 12 inch digital X-ray film.Exposure doses were calculated according to age, zone of exposure and tissue thickness. The exposed doses were from 50to 55KV,25mA exposure time 0.2-0.3 seconds. Shooting also checked by measuring height, weight and other indicators of growth and development. The interpretation using of GP, CHN, and China 05 three kinds of methods for13-16years old girl, attain the percentage of degree of development of puberty girls in the Beijing area to assess the developmental level of adolescent girls on the current. Single-factor analysis of variance with statistical methods of three kinds of differences in the larger of two ways.Results:Postpuberty girls in 16-21years old, through quantitative analysis of radial epiphysial line to find the corresponding between the age and the proportion of the disappearance of epiphysial line, designated half of year old to find the picture of mode. Between the chronological age and the degree of disappearing of epiphysial line made a regression equation.13-16 age group in the interpretation of bone age in girls, bone age subtract calendar age, the level judged to be mature, developmental level of the percentage of early development ratio than normal development of the highConclusions:Three kinds of bone age evaluation methods in different age groups is not consistent each other. Girls in Beijing complete healing of radial epiphysial cartilage to reach the time of the half degree of skeletal maturity is 16.4 years old. The editor hope that this paper experimental piece can provide an important reference for hand-wrist skeletal age evaluation and bone development in late pubertal girls. Meanwhile, it provides a concrete and feasible approach to sporting events in different age groups, especially large age group division It plays the role of complement and improvement to the interpretation of bone age in the general population in order to ensure an extension of bone age assessment.
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