The “bone age” of a child is the average age at which children reach this stage of bone maturation. A child’s current height and bone age can be used to predict adult height. For most people, their bone age atlas of pediatric physical diagnosis free download pdf the same as their biological age but for some individuals, their bone age is a couple years older or younger. Those with advanced bone ages typically hit a growth spurt early on but stop growing early sooner while those with delayed bone ages hit their growth spurt later than normal.
The long bones of the leg comprise nearly half of adult height. As growth nears conclusion and attainment of adult height, bones begin to approach the size and shape of adult bones. The remaining cartilaginous portions of the epiphyses become thinner. A small amount of spinal growth concludes an adolescent’s growth. The bones in the x-ray are compared to the bones of a standard atlas, usually “Greulich and Pyle”. An atlas based on knee maturation has also been compiled. Bone age rating is a procedure well-suited for automation by computer.
The main advantage is the elimination of the variability of rating between different human raters. Statistics have been compiled to indicate the percentage of height growth remaining at a given bone age. By simple arithmetic, a predicted adult height can be computed from a child’s height and bone age. Separate tables are used for boys and girls because of the sex difference in timing of puberty, and slightly different percentages are used for children with unusually advanced or delayed bone maturation.