Abstract:Objective To observe the results of developmental dysplasia of the hip in infants and evaluate the value of ultrasonography in the early diagnosis. Methods A total of 1,500 healthy infants (3,000 hips) were selected from September 2014 to June 2016. The risk factors of developmental dysplasia of the hip(single and twin, malposition, long term, dystocia, etc.), thigh or hip striae, outreach test and other clinical screening, ultrasound examination results, and Graf classification were analysed. Results Abnormality rate was 25.20% (378 cases) in clinical screening and 5.82% (22 abnormal cases, 44 cases of hip joint) in ultrasonic screening. The abnormality rate of female infants was significantly higher than that of the male infants (P <0.05). The abnormality rate of left hips was significantly higher than that of the right hips (P < 0.05). The risk factor of the highest percentage was binding double-limbs in patients in abnormal clinical screening (P < 0.05),followed by positive family history of DDH (P < 0.05). Abnormal ultrasound diagnosis was consistent with clinical screening. Angle α was positively correlated with age ( r= 0.104, p< 0.05), and Angle β was negatively correlated with age (r = -0.116,p < 0.05). Conclusions Screening of developmental dysplasia of the hip for infants can be helpful to obtain the epidemiological data in local areas, to carry out early intervention and to reduce the morbidity. Ultrasound can significantly improve the diagnosis of DDH, which can be used as a routine screening method.