Roentgenologists, pediatricians and persons engaged entirely in research on child development have proposed numerous methods for appraising the skeletal changes of children. These methods have been devised in general to provide standards of osseous development. The roentgenologist and the pediatrician have used them to determine whether individual children were skeletally advanced or retarded, since appraisal of advancement or retardation is an aid in the diagnosis of endocrine1 and nutritional2 disorders. Research workers in the field have been interested because they wished an objective measure of the progress of one of the developing systems of the child for comparison with the progress of other developing systems, for correlation with his mental scores,3 economic status, height, weight4 or dentition.5 Out of
(Footnotes continued on next page) these various interests have come a variety of methods of skeletal appraisal. Skeletal development includes, of course, differentiation as well as
SONTAG LW, SNELL D, ANDERSON M. RATE OF APPEARANCE OF OSSIFICATION CENTERS FROM BIRTH TO THE AGE OF FIVE YEARS. Am J Dis Child. 1939;58(5):949–956. doi:10.1001/archpedi.1939.01990100031004
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