الفهرس 
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Abstract
Hip joint starts it’s intrauterine development in the 8th week of fertilization .
It is a synovial ball and socket joint with wide range of motion ,composed of proximal femur and acetabulum .
Developmental dysplasia of the hip (DDH) is a spectrum of disorders of development of the hip that present in different forms at different ages. The common etiology is excessive laxity of the hip capsule with a failure to maintain the femoral head within the acetabulum. The syndrome in the newborn consists of instability of the hip such that the femoral head can be displaced partially (subluxated) or fully (dislocated) .
DDH can be diagnosed clinically and radiographically by ultrasound, x-ray ,ct scan, arthrography, and MRI .