Objective To explore the clinical significance of ultrasound diagnosis of developmental dysplasia of the hip (DDH) in infants aged 0-6 months.

Method  12 708 infants with suspected DDH (0-6 months old) who were diagnosed and treated in Children's Hospital Affilicated to Zhengzhou University from May 2015 to February 2022 were planned to be studied. All infants were diagnosed with Graf ultrasound, and the results of Graf ultrasound diagnosis and Graf classification were analyzed, and α, β angle and ultrasonic image features of the abnormal hip joint and normal hip joint were compared, clinical intervention and reexamination of children with abnormal hip joint were conducted, and the results were analyzed.

Result  In this study, a total of 12 708 patients were screened, including 5 210 males and 7 498 females. A total of 25 416 hips were screened, including 966 DDH (Graf IIa and above) hips, accounting for 3.8% of the total number of hips. The total number of DDH patients was 438, including 300 female DDH children, accounting for 68.49%, and 313 DDH children aged 0 to 3 months; Compared with the normal hip, the α angle is smaller and the β angle is larger in the DDH hip (P<0.05).

Conclusion  Graf ultrasound diagnosis of DDH in infants aged 0-6 months has many advantages, such as convenience, repeatability, non-invasive, etc. At the same time, it has high resolution for soft tissue and cartilage, which can effectively display the situation of DDH.

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