Objective:To study whether the bone age of the left and right limbs in children was consistent when the ossification ratio was measured by ultrasound,and to compare this consistency between ultrasound bone age of left and right limbs,and the bone age that was determined by X-ray. Method:A total of 526 children aged 3 to 18 years,who were treated at the Affiliated Hospital of Guizhou Medical University from October 2022 to November 2023,were retrospectively included. The ossification ratios of the left and right ulna,radius,and femur of these children were measured by using ultrasound to calculate the bone age of ultrasound. Simultaneously,all children underwent X-ray examination on left-hand for bone age within two weeks before and after the ultrasonic examination for bone age. The differences in ossification ratios of the ulna,radius and femur of dual sides in assessing bone age by using ultrasound were compared,and the differences of assessing bone age among left ultrasound,right ultrasound and X-ray were further compared. Results:In the ultrasound test,Ossification rate of the left ulna was 48.0％,Less than 49.5％ on the right side,The difference was statistically significant (W=25425.5,P<0.001),the left femoral ossification rate was 77.0％,Higher than 76.0％ on the right side,The difference was statistically significant (W=57829,P=0.041). The overall ossification rate of the left ulna,radius,and femur was 184.0％,Below 185.0％ on the right side,The difference was statistically significant (W=46314.5,P<0.001). The ultrasound bone age of the left limb was 10.1 years,Below 10.3 years on the right,The difference was statistically significant (W=67958.5,P<0.001). The median X-ray bone age of the included children was 10.2 years between ultrasound bone age and X-ray bone age (P>0.05). Conclusion:There is difference in the bone age between left and right side of limbs in assessing bone age by using ultrasound to detect ossification ratio. Therefore,the left and right sides should be assessed by using ultrasound to assess bone age.

Objective:To study whether the bone age of the left and right limbs in children was consistent when the ossification ratio was measured by ultrasound,and to compare this consistency between ultrasound bone age of left and right limbs,and the bone age that was determined by X-ray. Method:A total of 526 children aged 3 to 18 years,who were treated at the Affiliated Hospital of Guizhou Medical University from October 2022 to November 2023,were retrospectively included. The ossification ratios of the left and right ulna,radius,and femur of these children were measured by using ultrasound to calculate the bone age of ultrasound. Simultaneously,all children underwent X-ray examination on left-hand for bone age within two weeks before and after the ultrasonic examination for bone age. The differences in ossification ratios of the ulna,radius and femur of dual sides in assessing bone age by using ultrasound were compared,and the differences of assessing bone age among left ultrasound,right ultrasound and X-ray were further compared. Results:In the ultrasound test,Ossification rate of the left ulna was 48.0％,Less than 49.5％ on the right side,The difference was statistically significant (W=25425.5,P<0.001),the left femoral ossification rate was 77.0％,Higher than 76.0％ on the right side,The difference was statistically significant (W=57829,P=0.041). The overall ossification rate of the left ulna,radius,and femur was 184.0％,Below 185.0％ on the right side,The difference was statistically significant (W=46314.5,P<0.001). The ultrasound bone age of the left limb was 10.1 years,Below 10.3 years on the right,The difference was statistically significant (W=67958.5,P<0.001). The median X-ray bone age of the included children was 10.2 years between ultrasound bone age and X-ray bone age (P>0.05). Conclusion:There is difference in the bone age between left and right side of limbs in assessing bone age by using ultrasound to detect ossification ratio. Therefore,the left and right sides should be assessed by using ultrasound to assess bone age.