Anatomical Age
Definition
Anatomical age is the numerical assessment of a child's physical growth in relation to the statistical average based on the child's chronological age.
Description
Using statistical data, the American Academy of Pediatrics and the National Institutes of Health in the United States have developed tables to illustrate the growth patterns of children. These tables describe the population of all children of a certain age, with ranges for weight, height, and other physical characteristics. For most children, anatomical age—based on weight and height measurements—is the same as chronological age—based on the number of months or years since birth. However, when a child's physical growth falls outside the range of his chronological age, the child's age is determined by his growth. For example, if a six-year-old's height and weight falls within the range for five-year-olds, his anatomical age will be given as five, not six years.
Anatomical age has been used as a determination of chronological age by immigration and adoption agencies when no birth certificates have been available. This has been crucial for refugee children in particular. However, prolonged malnutrition can cloud actual age assessments. That is why radiographs, or x rays, of a child's bones have been taken and read by osteologists (doctors who special in the skeletal system) and radiologists.
William Walter Greulich and S. Idell Pyle's atlas of skeletal development and Tanner and White's method are the two major assessment tools for wrist radiography. X rays of a child's left wrist are compared visually with a series of x rays of wrists of children of various ages. A computerized system has been developed based on Tanner and Whitehouse's model, which uses pattern recognition like finger print databases. This technique greatly speeds up the diagnostic process.
In addition, an ultrasound version of the Greulich-Pyle Atlas has proven to be as effective as wrist x rays. This method does not expose children to radiation.
Common problems
Standardized growth charts and wrist radiographs can assess normal skeletal growth and determine whether there are problems concerning growth that is too fast or
