One previously trained observer assessed skeletal maturity in a representative sample of 388 and 387 healthy girls and boys respectively from La Plata city, a predominantly university and administrative urban centre in Argentina. The staging system used was TWII and the scores were calculated from three sources: British, Spanish and Italian standards. Our sample showed a marked advancement in bone age with regard to chronological age when using British standards and, to a lesser extent, when applying the Spanish standards. Local mean bone ages were very similar to chronological ages when the Italian scores were used. Second-degree polynomials were adjusted to log10 scores for boys and girls, in order to obtain local values for bone age (BA) transformations. The same staging system should be used in clinical work in Argentina, with the corresponding changes in BA transformatons. A marked advancement of carpal BAs with regard to RUS BAs was found, from age 5 onwards, in both sexes. Mean differences and SD of RUS-minus-carpal BA were 1.28, SD 1.08 and 1.18, SD 1.09 years for girls and boys respectively. These differences have not been described before, and require further investigation.
EDITORIALPlease cite this paper as: D'Orazi V, Ortensi A. Use of optical magnification and microsurgical technique in general surgery.
Bone age is widely used as an osseous maturation method to assess biological development in clinical and auxological studies. Numerical methods for calculating bone age have better replicability; however, they require a wide data manipulation. The aim of this study was to evaluate the accuracy of bone age estimation by using just a few ossification centers. In 205 hand and wrist radiographs of children and adolescents, aged 0.9-17.4 years old (111 males and 94 females), bone age was determined by two trained observers employing the five-bone (B5) and the TW2 methods. To compare the results of the two methods, the mean differences by age and sex were tested by the Mann-Whitney test. The relationship of the bone age distribution estimated by B5 and TW2 was calculated and the mean of the bone age determined by the two methods was plotted by age and by differences between bone age calculated by the two methods ± 2 SD. The bone age determined by B5 was between 1.2 and 16.8, and by TW2 was between 1.2 and 18.0 years. The mean differences between B5 and TW2 (-0.06 ± 0.6) were not significant (p >0.05). The distribution of mean differences by age and method demonstrated that all deviations were encompassed into ± 2 SD with no particular
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