The growing hip is characterized by the interaction of 11 growth plates. It is a dynamic process involving the hierarchic action of several parameters: size, depth, orientation of the acetabulum, alignment and elongation of the femoral neck, coverage and configuration of the femoral head, morphology of the pelvis, and consistency of the periarticular muscles and soft tissues. There are changing patterns of proximal femoral vascularity, and nothing is achieved until the end of growth. The most latent dysplasia can be seen at puberty. A long-term analysis is essential since morphological abnormalities de-compensate only after several years. As time goes on, it is difficult to catch up with abnormal growth. There is a mutual dependence between the femoral head and the acetabulum, but the growth of the acetabulum doesn't match that of the femur and seems to move ahead of it.