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目的 探讨儿童青少年骨体重负荷对腰椎和髋部骨矿含量 (BMC)、骨密度 (BMD)的影响 ,并比较两指标的优次。方法 应用DXAQDR - 4 5 0 0A型扇形束骨密度仪测量长沙地区 5 4 7例 6～ 15岁儿童青少年腰椎前后位 ,仰卧侧位及髋部股骨近端的骨量。结果 不论男女 ,儿童青少年体重、体块指数 (BMI)、腰椎及髋部BMC和BMD随年龄增加而增加 (P <0 .0 5或 0 .0 1) ;体重与BMC的相关性较体重与BMD的相关性更密切 ;髋部及腰椎各部位体重标准化BMC随年龄增加而增大 ,而髋部和腰椎各部位体重标准化BMD随年龄增加反而减小。结论 6～ 15岁儿童青少年腰椎及髋部BMC指标判断骨强度优于BMD ,尤以髋部及腰椎侧位BMC为佳。
Objective To investigate the effect of bone mass load on bone mass and bone mineral density (BMD) in lumbar spine and hip in children and adolescents and to compare the superiority of two indexes. Methods The bone mass of 547 children aged 6-15 years old in lumbar region of lumbar aorta, supine position and proximal femur of Changsha city was measured by DXAQDR - 4500 type fan - beam bone density instrument. Results The body weight, body mass index (BMI), BMC and BMD of lumbar spine and hip increased with age (P <0.05 or 0.01), and the correlation between body weight and BMC was higher than that of body weight The BMD was more closely related to BMD. The body weight normalized BMC in hip and lumbar spine increased with age, while the body weight normalized BMD in hip and lumbar spine decreased with age. Conclusions The BMC index of lumbar spine and hip in children aged 6-15 years is better than that of BMD, especially in the hip and lateral BMC.