Developmental Dysplasia of the hip is a common hip condition that affects around 1-3% of newly born children. Moreover, it is the main reason accounting for around 29% of primary hip replace¬ments up to the sixties of age. The management of developmental dysplasia of the hip mainly tries to early diagnose, to start the treatment. Concentric reduction of the hip, and adequate coverage of the acetabular roof are the determinants of treatment whether the hip is in place, subluxated, or highly dislocated. Open reduction alone may provide persistent reduction for several years; however, the lack of adequate osseous roof over the femoral head would cause biomechanical problems in adulthood. In contrast, Dega osteotomy provides much better coverage and the final result would be more anatomical, which may prevent the child from developing further joint problems in the future. This study was carried out at Benha University Hospital on two groups as follows: Group A: 10 patients underwent open reduction with DEGA, Group B: 10 patients underwent open reduction without DEGA. Mean age of the study population was 21 months in group A, 19 months in group B. The affected side was right side (50.0%) while left side was 50.0%. The IHDI median of the two groups was grade 1 in group A, while it was grade 3 in group B. At 6 months, acetabular index was significantly higher in group B (49) compared to group A (38). P value was