【Objective】 The methods for assessment of skeletal maturity in the children less than 5 years of age were provided. 【Methods】 The sample was 2 468(1 245 boys,1 223 girls)normal Han children aged 0~5 years from the study of "The Standards of Skeletal Maturity of Hand and Wrist for ChineseChina 05". The developmental index (DI) of bones in hand and wrist were estimated by the ages of attainment for TW3 skeletal development stages, which were calculated by probability unit. The LMS method was used to fit centile curves of DI for all bones of hand and wrist (R+C) and the Carpal bones (CARP). 【Results】 The smoothed 3rd, 10th, 25th, 50th, 75th, 90th, 97th centile curves were charted respectively for R+C and CARP, and the differences between percents of cases below the fitted centile curves and expected values were 0.1%~2.3%. There were notable sexual discrepancy in rate of skeletal development for hand and wrist. The DI of R+C were rapidly increased after 0.5 year in girls and 1 year in boys, and the DI of CARP after 1 year in girls and 1.5 years in boys, respectively. The increase of velocity for DI in girls was more rapid than in boys. 【Conclusions】 The ossification centre of boys and girls are appeared in succession after 0.5 year of age. The centile curves of DI for R+C and CARP should be used for skeletal maturity assessment in children less than 5 years of age.
Key words
skeletal age /
hand and wrist /
developmental index /
children
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