LIU Dan1, ZHOU Xiaoª²Dong1, ZHAO Li2, HAN Zengª²Hui1, YU Ming1, ZHAO Liang2

    1Department of Ultrasonic Diagnosis, 2Department of Orthopedics, Xijing Hospital, Fourth Military Medical University, Xi¬ðan 710033, China

    ¡¾Abstract¡¿ AIM: To investigate the value of ultrasonic examination for earlier diagnosis of developmental dislocation of the hip (DDH) by measuring the ultrasonography of infant hip ¦Á angle, ¦Â angle and acetabular coverage of femoral head (MR value). METHODS: 5.0-7.5 MHz linear transducer was used for the frontal ultrasonographic sectional study of infant hip according to Graf¬ðs method. In 17 cases suspected as developmental dysplasia of hip, 19 hips underwent ultrasonic examination, and normal control group was set up according to month age. RESULTS: Ultrasonic examination basically demonstrated the anatomic structure of frontal profile of infant hip. In normal control group, ¦Á angle was 65.3¡ã¡À4.5¡ã, ¦Â angle 40.6¡ã¡À7.5¡ã, MR value (64.2¡À5.2)%; in DDH group, ¦Á angle 48.4¡ã¡À6.2¡ã, ¦Â angle 53.0¡ã¡À10.1¡ã, MR value (40.6¡À10.8)%. Compared with normal group, MR and ¦Á angle reflecting the development of osseous acetabulum decreased, and ¦Â angle reflecting the development of cartilaginous acetabulum increased. Ultrasound also displayed glenoid labrum and other soft tissues of acetabulum which couldn¬ðt be displayed by Xª²ray. CONCLUSION: Ultrasonagraphy of the infant hip is a convenient, fast, nonª²invasive method for earlier diagnosis and followª²up examination of infant DDH. ......