Developmental dysplasia of the hip (DDH) is a dynamic disorder in which the relationship between the proximal femur and the acetabulum is disrupted and may develop due to various causes before or after birth. It is a condition that should be treated with early diagnosis and for this reason, hip ultrasonography scans are performed in newborns. Knowledge of the pathologic anatomy in patients with DDH is critical for surgical planning and management. During surgical planning, the anatomy of the acetabulum and femur and their relationship with each other should be evaluated in detail by direct radiography and sometimes computed tomography. The placement of the acetabular component, the need for femoral osteotomy and the type of implant to be used should be decided during this planning. It should be kept in mind that cemented implants can be used in cases where acetabular bone stock is not good or uncemented implants can be used with graft support. In patients undergoing subtrochanteric shortening osteotomy to the femur, we can achieve adequate stability with the femoral component alone, but plate-screw and cable fixation systems should always be available in these patients. Early mobilization in the postoperative period is important to prevent thromboembolic events. It has been reported that arthroplasty for coxarthrosis secondary to DDH can provide satisfactory results with correct patient selection, careful surgical techniques and appropriate postoperative management. In addition, the importance of informing patients preoperatively about the risks of complications was emphasized.