Closed Reduction With Anesthesia and no Anesthesia for Developmental Dislocation of the Hip < 6 Months

Inclusion Criteria: * The patients with GrafⅢ/Ⅳtype DDH diagnosed by ultrasound or if they were IHDI (International Hip Dysplasia Institute) grade III or IV on radiographs，and The infants who were \<6 months of age. Patients were followed for at least 18 months,by which time they had either completed treatment with no evidence of requiring further treatment or were treated surgically after failing brace treatment. Exclusion Criteria: * Infants were excluded if they had multiple congenital abnormalities, had prior treatment in other centres, or showed teratological dislocations. The last were defined as fixed dislocation of the hip in association with either a recognised syndrome or a neurological disorder.