正常学龄儿童超声骨密度测定分析

Analysis on bone mineral density detection by ultrasound in healthy school children

目的:分析正常学龄儿童超声骨密度的变化规律,指导儿童临床和保健工作。方法:采用定量超声技术(QUS)测定长居广州市的475例6～12岁正常儿童的跟骨定量超声参数[超声传导速度(SOS)、超声衰减系数(BUA)和骨强度指数(STI)],同时测量受检者体重和身高。结果: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值随年龄增加而降低,男童9岁、女童8岁时降至最低,之后随年龄增加而增加,在11岁时出现一高峰后又下降。同年龄男、女童的SOS、BUA、STI值比较差异均无统计学意义(P>0.05)。结论:6～12岁正常儿童的超声骨密度因年龄不同而呈现不同规律,而同年龄男、女童比较差异无统计学意义,在评价时应予考虑。

Objective：To analyze the change regularity of ultrasonic bone mineral density in healthy school children,direct the children’s clinical and health care works.Methods：Quantitative ultrasound technique was used to detect the calcaneal quantitative ultrasound parameters 〔ultrasound conduction velocity（SOS）,ultrasonic attenuation coefficient（BUA） and bone strength index（STI）〕 of 475 healthy children aged 6-12 years old in Guangzhou,body weight and body height of the children were measured.Results：SOS of children aged 6-12 years old decreased with age,and BUA increased with age;STI decreased with age,STIs of 9-year-old boy and 8-year-old girl were the lowest,then increased with age,there was a peak in 11-year-old,then decreased;there was no significant difference in SOS,BUA and STI between boys and girls in the same age groups.Conclusion：The ultrasonic bone mineral density of healthy children aged 6-12 years old changes with age,but there is no significant difference in SOS,BUA and STI between boys and girls in the same age groups,the phenomenon should be considered when evaluation is conducted.