Establishment and discussion of ultrasonic prediction model for outcome of children with DDH under 6 months treated with Pavlik sling

Although Pavlik slings are widely used for the treatment of DDH in children aged 0–6 months, the time point between Pavlik sling and cast treatment is currently debated.This study aims to establish a set of prediction models based on ultrasound indicators and risk factors of children.A total of 102 children, with Pavlik harness failure (n = 22) and Pavlik harness success (n = 80) were included in this study.By comparing the change rate of Pavlik harness treatment between the two groups and establishing a predictive model based on multivariate analysis of follow-up data, 2 months after birth is recommended as the initial age for ultrasound screening of DDH in northwest China. According to the risk factors, the children were divided into 4 grades, and different grades corresponded to different treatment strategies. The end of Pavlik harness treatment was set at 4 months of age.In case the hip joint remained unstable by the time the infant was 4 months old, plaster therapy would then be carried out.