Ultrasonic quantitative analysis of the flexion cornal hip in the normal infant

Abstract

Objective To study the influencing factors and clinical significance of ultrasonic quantitative analysis of the hip-flexion coronal section in the normal infants. Methods Totally 100 normal infants were enrolled. Angle α, angle β and FHC on different positions(mild-flexion and flexion of the hip) were mearured.And angle β on different points(the labrum central and the acetabular tips) were measured. The variation of the measurement index between different positions were analyzed. Results ①There was no significant difference in angle α between the neutral position and hip-flexion position (P>0.05). ②FHC decreased in the hip-flexion position, and there was significant difference compared with the neutral position (P<0.05). ③βc were greater than βt in the two positions (P<0.05); βc and βt were all greater in hip-flexion position than those in neutral position, the difference was statistically significant (P<0.05). Conclusions The results obtained from angle α is stable under the coronal flexion view of the normal infants, and does not vary with changing position. The change of the angle β and FHC with the hip flexion could be used to evaluate the stability of the hip. Measured angle β on the labrum tip has good repeatability. So this point should be selected to measure the angle β. Key words: Ultrasonography; Infant; Hip joint; Position