Bone age can determine whether growth and development are normal and infer whether there is still a possibility of growth. When measuring bone age, it is important to check the long bones, which consist of bone scales and periosteum, the former of which can elongate the backbone and the latter of which can thicken the backbone. From infancy to adulthood, the bone scale does not develop at a constant rate, but generally grows faster in early childhood and puberty, so the bone age measurement can guide whether the development from infancy to adulthood is normal. Bone age measurement is often used clinically to determine development by determining the number of ossifications in the tester’s wrist, which is more accurate. For adolescents under 16 years of age, it is recommended to use left hand radiographs to infer bone age, because the bony scales of the left hand and the groin line of the adolescent have not yet closed, so bone age can be inferred. 16 years of age or older is recommended to check the large joints of the hips and the knees, because people 16 years of age or older can not be detected because the hand conformation is closed and the large joints of the conformation have not yet closed, so they need to be examined in order to effectively determine the age of the knees and the knees. The hip joints need to be examined in order to effectively measure bone age in people over 16 years of age. It should be noted that human growth is affected by nutrition, heredity, sleep, exercise and other factors. If developmental delay is detected through bone age measurement, it is recommended that corresponding improvements be made under the guidance of a doctor. You should pay attention to balanced nutrition, increase exercise and maintain a good lifestyle.