Relative growth of hand bone length to width by longitudinal investigation
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概要
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Although many studies of the hand bone growth have done, there were few reports on their longitudinal study. In this article, the hand bone growth of longitudinal materials was studied from the standpoint of the relative growth.Radiographs of the hand bone of 16 boys and 21 girls were taken from 9 to 15 years of age at 6 month intervals. Lengths and widths of 5 metacarpal and 14 phalangeal bones were measured on the serial radiographs. The relative growth coefficients of length against width were calculated by means of least squares. The allometry formula y=bxa was valid to 19 hand bones for each individual. Each individual relative growth of 19 hand bones was suitable to simple allometry.Mean values and coefficients of variation of relative growth coefficients in the girls were almost larger than those in the boys. On the digit bones the marginal group grew wider than axial group. The growth gradients of the digit and the metacarpal bones within rows was reverse.The rank order correlation analysis of individual numerical order of 19 relative growth coefficients (growth gradient) showed that there are many variations from the person who have many significant correlative pairs to the person who have none. On the individual growth the growth gradient showed a tendency to be more similar in girls than in boys. The growth gradient on the average growth had only a few significant correlation with each individual growth gradient. It was suggested that the growth gradient of a paticular person is better representative of this group than that of average growth.Principal component analysis was accomplished to make individual variations clear. Four principal components whose eigenvalues exceeded unity were obtained from principal component analysis of the correlation matrix. Those were interpreted as the relative growth factors of the hand bone by the highest loadings as follow: F1, a size factor of relative growth coefficient. F2, a factor concerning distal and metacarpal phalanx opposition to middle and proximal phalanx. F3, a factor on marginal bones.From the scatter diagram plotting the 2nd component scores against the 1st component scores, on the 1st component girls' scores were higher than boys. On the contrary boys' component score were higher on the 2nd component. Girls' scores on the both components were more variable. The hand bone growth in girls was more variable in size but less variable in growth gradient than in boys.
- 日本人類学会の論文
日本人類学会 | 論文
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