271例3～11岁儿童骨密度分析

Body Density Analysis of 271 Children Aged 3 - 11

目的：探讨儿童时期全身及身体各部位骨密度的变化规律，方法：选择济南市区无任何内外科疾病、未出现第二性征的271例3—11岁儿童作为研究对象，采用美国LUNAR公司生产的DPX—NT型双能X线骨密度仪测量全身及各部位（包括头、上肢、下肢、躯干、肋骨、骨盆和脊柱）的骨密度。结果：儿童时期骨密度值随年龄增长而增加，身体各部位的骨密度存在显著的性别及年龄差异。尽管骨的发育因躯体部位、性别、年龄而异，但男、女童均在6～8岁年龄段增长较快，9～11岁时增长缓慢。结论：骨的发育因性别、年龄和部位不同而呈现不同规律，在评价骨密度时应予以考虑。

Objective： To research the changing regularity of the childhood bone density in the whole body and some parts of the body. Methods： 271 children whose age from 3 to 11 have been chosen as the research objects in Jinan region. They had no any disease and have not appeared secondary sex characteristic. The bone densities of the whole body and some parts （ contain head, manus, legs trunk, ribs, pelvis and spine） have been measured using dual energy X ray absorptionmetry （DXA） made in USA. Results： The bone density in childhood is increasing with the childreng age, and there are great differences in bone density of each part of trunk when the children are different in sex and age. The bone density of the boys and girls all grows faster in 6 - 8 years old and slower in 9 - 11 years old in despite of they are different in the part of body, sex and age. Conclusion： The bone＇s growth of the children is different in sex, age and the part of body, which should be considered in the evaluation of bone density.