Introduction: Developmental dysplasia of the hip (DDH) is a result of altered hip joint morphology and on a 
worldwide basis occurs between 0.87 and 10.5 per 1000 live births. Aim of the work: Clinical and 
radiological evaluation of the open reduction, Dega osteotomy, and derotational femoral osteotomy for 
management of DDH after walking age Patient and Method: A retrospective study of 17 patients 
diagnosed with DDH managed by open reduction, Dega osteotomy, and femoral derotational osteotomy 
(FDO) and fixation by plate and screws. Results: Our study includes 13 female and 4 male patients and the 
age ranges from (1.5-3.7) years with a mean of 2.5±0.7 According to McKay modified criteria 20.83% (5 hips) 
were rated as excellent, 70.83% (17 hips) were rated as good, 4.16% (one hip) was rated as fair, and 4.16% 
(one hip) was rated as poor. While the radiological results were evaluated by Severin classification included 
79.2% (19 hips) were type I , 12.5% (3 hips) were type II, 4.16% (one hip) was type III, and 4.16% (one hip) 
was type VI. Conclusion: In the management of DDH after walking age we perform open reduction, Dega 
osteotomy and femoral derotational osteotomy.