正常儿童跟骨超声骨密度测定及其影响因素

目的 在建立定量超声骨密度测量精密度的基础上,分析正常儿童超声骨密度的变化规律及其影响因素.方法 采用定量超声(QUS)技术测定长居广州市的475名6～12岁正常儿章的跟骨QUS参数[超声传导速度(SOS)、超声衰减系数(BUA)和骨强度指数(STI)],同时测量受检者身高和体重.结果 同年龄男、女章的SOS、BUA和STI差异均无统计学意义.6～12岁正常儿童SOS值随年龄增加而降低,BUA值随年龄增加而增加.STI值男童在9岁、女童在8岁降至最低,之后随年龄增加而增加,在11岁出现一个高峰后又下降.年龄和身高是超声骨密度参数的主要决定因素.结论 6～12岁正常儿童的跟骨超声骨密度因年龄不同而呈现不同规律;年龄和身高是影响儿童骨密度的重要因素.

Ultrasonic observation of bone density and influencing factors in health children

Objective To analyze the changing regularity of the ultrasonic bone density and influencing factors in healthy children based on the accurate measurement of the bone density with quantitative ultrasound (QUS). Methods The QUS parameters of calcaneus, i.e. speed of ultrasound (SOS), broadband ultrasound attenuation (BUA) and bone stiffness index (STI) of 475 Guangzhou normal children in 6-12 year-old were measured, and the weight and height were measured as well. Results There was no significant difference of SOS, BUA and STI between boys and girls in the same age groups. When age increasing, SOS in 6-12 year-old normal children decreased significantly, while BUA increased. In 9-year-old boy and 8-year-old girl, STI were the lowest, and then it inclined, there was a peak in 11-year-old. Age and height were the main determining factors in children bone density. Conclusion The development of ultrasonic bone density of calcaneus changes with the age changing. The important influencing factors of children bone density are age and height.