Epidemiological investigation and ultrasonic diagnosis of developmental dysplasia of the hip in Chinese infants A large multi-center cohort study

Abstract

Developmental dysplasia of the hip (DDH) is common among Chinese infants, but a lack of large-scale, multi-center epidemiological studies has made it difficult to characterize the risk factors associated with this disease.This multi-center cohort study included 19,833 Chinese infants aged 14days to 6months. A multi-center ultrasound protocol was used to diagnose hip abnormalities, and epidemiological data of the infants were collected through questionnaires. Categorical variables were expressed as percentages and compared using x2 test. Multivariate analysis was performed through logistic regression. Of 19,833 infants, 345 had DDH (1.7%). DDH incidence was higher in female infants (n=279) than in male infants (n=66) (x2= 95.89, P