| Abstract: | Serial annual radiographs of the hand have been used to analyze the rates of elongation of the epiphyses and diaphyses of the metacarpals and phalanges in children at ages from 3 to 13 years. The rates of elongation for many corresponding ephiphyses and diaphyses (i.e., of the same bone) are negatively correlated but to an extent that is not statistically significant for any particular bone. This tendency toward negative correlations is found for most of these bones although the correlation coefficients for most of the metacarpals are positive in each sex. Within rays, the correlation indices between the rates of elongation for corresponding epiphyses and diaphyses (i.e., of the same bone) have larger negative or smaller positive values than for those between either adjacent and non-corresponding or non-adjacent and non-corresponding epiphyses and diaphyses (i.e., not of the same bone but of either adjacent or non-adjacent bones). The communality indices for the ratio between the rates of epiphyseal and diaphyseal elongation in particular bones are more highly correlated in the girls than in the boys and within the rows than within the rays. Some implications of the tendency to negative correlations between the rates of elongation of corresponding epiphyses and diaphyses have been discussed. |
