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Bone age is defines as maturity of children’s bone. It is the average age at which the child bones matures, after the birth in the long bones only metaphyses is there (eg: radius and ulna, Humerus, tibia, femur, fibula, phalanges). In long bones initially there is elongation of epiphysis. As the age progress the calcification of epiphyses occurs and it is evident on the x-ray. During puberty the bone development progress due to various hormones. The adult height is achieved after the puberty and the shape of adult bones appears during this period. The cartilaginous part of epiphyses become thinner and these areas become obliterated, during this time epiphyses are closed and no further growth of bones occurs. X-ray of wrist is taken because it depicts multiple bones and it can be compared with standard atlas of bones by using Greulich and Pyle method. The bones which occurs common changes as the age progress from infant age is seen maximum in pelvis and shoulder, the least changes are seen in wrist of infants. During infancy if the assessment of bone is required the wrist or hand x-ray can be done. The height possibility can be calculated with the help of height of the child and bone age. Various graphs and statistics are prepared to depict the % if height growth remaining as per the bone age. Various tables for girls and boys are available (bayley pinneau tables, Greulich pyle atlas). Constitution growth delay: Normal development variation with delayed bone maturation. It is due to growth hormone deficiency, hypothyroidism. Measurement of bone age is used for reliability in diagnosis of endocrine diseases and hereditary disease Bone age evaluation is usually done by radiological examination of the skeletal development of the left-hand, and then it is compared with the chronological age. Any abnormality in between these two values indicates abnormalities. This examination is used due 1) simplicity, 2) a minimum radiation exposure; 3) ossification centres are easily available. There is no standard clinical procedure in bone age assessment, even if the most used methods are: 1) the Greulich and Pyle (G&P) method and 2) the Tanner and Whitehouse (TW2 or TW3) methods. Both methods rely on X-Ray im>GET ANSWER