Assessment Of Skeletal Maturity Of The Digital Radiograph On The Hand-Wrist:A Comparison Among Methods

Purpose:To compared the difference Among RUS-CHN, CHN and Greulich-Pyle methods of bone age assessment. To discuss the change trend of different assessment results with age. To compare the growth difference of different methods. To establish the regression model between each other in order to contrast the difference among methods.Methods:Digital radiographs on the Hand-Wrist of 4686 subjects (2350 boys and 2336 girls) from 6 to 18 years in Beijing, qianjiang, guangan and wenshan were rated according to Greulich-Pyle, CHN and RUS-CHN. A year later, Digital radiographs on the Hand-Wrist of 225subjects (112 boys and 113 girls) from 6 to 10 years in Beijing were rated again. The statistical analysis were processed by SPSS. One-way ANONA, Pearson relative and Regression model were used to evaluate the differences and correlations among all the groups.Results:1) The CHN maturity of all groups are larger than the RUS-CHN maturity with significant difference (P< 0.05).2) The G-P atlas maturity of boys are less than the RUS-CHN maturity with significant difference (P<0.05) before the age of 9 years, and with no significant difference of girls, After 10 years of age, all G-P atlas maturity are larger than the RUS-CHN.3) The CHN maturity of all groups are larger than the G-P atlas maturity with significant difference (P<0.05) before the age of 10 years, and with no significant difference of boys in 11-13 years. After 13 years of boys, the former is less than the latter with significant difference (P<0.05). After 11 years of girls, the former is less than the latter with significant difference (P<0.05).4) The regression equations of CHN values predicted RUS-CHN are:Y=-0.126+0.959X (boys), Y=-0.590+0.988X (girls). The error value is 0.02 ～0.20 years.5) The regression equations of G-P values predicted RUS-CHN are:Y=2.994+0.722X (boys), Y=1.609+0.796X (girls). The error value of boys is 0.02 ～0.56 years, and of girls is 0.02-0.27 years.6) The regression equations of CHN values predicted G-P are: Y=-3.639+1.269X (boys), Y=-2.211+1.193X (girls). The error value of boys is -0.32～0.88years, and of girls is 0.14-0.62 years.Conclusions:1) The different methods have the different applicability in different regions. The CHN maturity are larger than the RUS-CHN maturity in all groups. The change trend of them have a certain consistency. The difference of the G-P atlas is casual. The regression equations of CHN values predicted RUS-CHN are good prediction effect. The regression equations of G-P values predicted RUS-CHN and CHN values predicted G-P are gender differences. The predicted effect of girl’s group is better than the boy’s.