Explanation:
Developmental dysplasia of the hip (DDH) is commonly evaluated radiographically using parameters such as acetabular index and Shenton's line integrity. Disruption of Shenton's line indicates displacement of the femoral head from the acetabulum. However, Perthes-like epiphyseal changes may appear after treatment complications rather than primary pathology. Early diagnosis relies heavily on ultrasound before ossification. Radiographs become useful after 4–6 months when the femoral head ossifies. Recognizing radiographic signs helps guide early treatment such as Pavlik harness application. Reference: Tönnis D. "Congenital Dysplasia and Dislocation of the Hip in Children and Adults." Springer, 1987.