答 小儿骨骼的发育,最突出地表现为软骨的骨化。骨化即骨骺等处骨化中心的出现,形状的改变,骨骺与骨干闭合等。骨化过程按一定的时间次序进行,故可用X线检查测定骨骼的发育年龄,即骨龄。骨龄的单位为“岁”、“月”。骨龄是衡量生长发育成熟较准确的尺度。根据骨龄与患儿实际年龄的比较,可判断发育过早或过迟。腕部骨骼发育仅为全身骨骼发育的一部分。腕部骨化中心在9～10岁左右全部出现,但骨胳的发育并未完成。在20岁左右全身长骨的骨骺和骨干均闭合,此时骨骼在形态上的发育才基本完成。因此,骨龄的 Answer: The development of pediatric bones, the most prominent manifestation of cartilage ossification. Ossification that epiphyseal ossification center, the appearance of changes in shape, epiphyseal and the closure of the trunk. Ossification process by a certain time sequence, it can be used to determine the development of bone X-ray age, that is, bone age. Bone age unit “year”, “month.” Bone age is a more accurate measure of growth and maturity. According to the actual age of children with bone age and compared to determine the development of early or too late. Wrist skeletal development is only part of the body’s skeletal development. Wrist ossification center in all 9 to 10 years old, but the development of bone has not been completed. In the 20-year-old body around the epiphyseal long bone and the bone are closed, then the skeleton in the morphological development was basically completed. Therefore, the bone age