Analysis in ultrasound screening results of developmental dysplasia of the hip in 1 534 infants aged 4 to 6 weeks

  Objective  To analyze the ultrasound screening results of developmental dysplasia of the hip (DDH) in 1 534 infants aged 4 to 6 weeks.

  Methods  High-frequency linear array probe and Graf method were used to perform the first-time ultrasonic screening of hip joint for 1 058 infants aged 4 to 6 weeks (gestational age≥37 weeks) from August 2020 to February 2021 in the child health clinic; in addition, 476 premature infants in the follow-up clinic of high-risk infants in the same period were collected, and they were conducted with first-time ultrasonic screening of hip joint after correcting gestational age with 4 to 6 weeks. The results of ultrasound examination of hip joint were compared between two groups, and the related factors affecting the development of hip joint were analyzed.

  Results  In 1 058 full-term infants, bilateral hip joints were detected for 2 116 times, 97 cases were detected with hip joint abnormalities, including 116 times of type Ⅱa and 1 time of type Ⅱc, and the detection rate was 9.17% (97/1 058). In 476 premature infants, bilateral hip joints were detected for 952 times, 16 cases were detected with hip joint abnormalities, including 8 times of type Ⅱa and 9 times of type Ⅱb, and the detection rate was 3.36% (16/476). Further analysis showed that the detection rates of DDH in the full-term infants, the female children and the left side were significantly higher than those in the preterm infants, the male children and the right side (P < 0.05). Analysis in the influencing factors of DDH showed that the detection rate of DDH in macrosomia was significantly higher than that in the infants with low body weight and normal body weight, and the detection rate of DDH in primiparas was significantly higher than that in multiparas (P < 0.05).

  Conclusion  B-ultrasound examination of hip joint is an effective method for screening DDH in the early stage after childbirth, and girls, left side, primipara and full-term macrosomia are the high-risk factors of hip dysplasia, so we should pay attention to the initial screening of DDH in the infants aged 4 to 6 weeks in clinical work.