正常婴儿屈髋冠状切面的超声定量分析及其临床意义

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

目的探讨正常婴儿髋关节屈髋冠状切面超声定量分析的影响因素及其临床意义。方法对100例婴儿分别进行中立位及屈髋90°髋关节冠状切面扫查，测量髋臼的α角、β角（包括经盂唇中央测量的βc角和经盂唇尖测量的βt角）以及股骨头骨性髋臼覆盖率（FHC），比较两种体位下以上测量指标的变化。结果①中立位及屈髋位下测得的α角的变化差异无统计学意义（P〉0．05）。②FHC在屈髋位时减小，与中立位比较差异有统计学意义（P〈0．05）。③两种体位下βc均大于βt，差异有统计学意义（P〈0．05）；屈髋位状态下，βc和βt均大于中立位的测值，差异有统计学意义（P〈0．05）。结论正常婴儿髋关节冠状切面下，所测得的髋臼α角结果稳定可靠，不受体位变化的影响。而髋臼β角、FHC随体位变化。β角测量点选取盂唇顶点重复性好，应选取该点测量β角。

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 （1）There was no significant difference in angle a between the neutral position and hip-flexion position （ P 〉0.05）. （2） FHC decreased in the hip-flexion position, and there was significant difference compared with the neutral position （ P 〈0.05）. （3）βc 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.