天津市221例青少年双能X线骨密度分析

Study of the bone mineral density detected by dual-energy X-ray absorptiometry in 221 adolescents of Tianjin

目的研究天津市12~19岁青少年腰椎和股骨近端骨密度(BMD)与性别、年龄及体质指数(BMI)的关系,为了解青少年骨骼发育的健康状况提供初步的参考依据。方法利用双能X线骨密度仪(DXA)对天津医院门诊221例12~19岁青少年进行腰椎(L1~4)、股骨颈和全髋BMD的检测,以Z值作为临床诊断标准。同时测量身高、体质量并计算BMI,比较青少年腰椎、股骨颈和全髋BMD在不同性别、年龄及BMI之间的差异。结果男女间腰椎BMD差异无统计学意义(P>0.05),而男性股骨颈和全髋BMD显著高于女性(P<0.01);腰椎、股骨颈及全髋BMD总体随年龄的增长而逐渐增加;BMI越大的青少年其腰椎、股骨颈及全髋的BMD也相应增加。结论青少年BMD与性别、年龄及BMI存在密切的关系,应重视青少年营养健康和体质指标的健康水平。

Objective To study the relationship between lumbar and proximal femoral bone mineral density(BMD)with gender,age and body mass index(BMI)in adolescents ranged from12to19years of age in Tianjin city,and provide preliminary reference to understand the bone health status of adolescent in the city.Methods The BMD values of lumbar spine(L1-L4),femoral neck and total hip were detected by the dual-energy X-ray absorptiometry(DXA)in221adolescents from Tianjin Hospital,and the Z value was used for clinical diagnosis standard.Simultaneously the height and weight of adolescents were measured,and BMI was calculated.The differences of BMD values in the lumbar,femoral neck and total hip were compared between different age,gender and BMI groups.Results The BMD values of femoral neck and total hip were significantly higher in males than those in females(P<0.01).The BMD values of lumbar spine,femoral neck and total hip were gradually increased with age.The BMD was correspondingly increased in adolescents with higher BMI in the lumbar spine,femoral neck and total hip.Conclusion There is a close relationship between BMD with age,gender and BMI in adolescents.We should pay more attention to the nutrition health and the level of BMI in adolescents.