Three cases of traumatic displacement of the upper femoral epiphysis in young children are presented. The authors emphasized that these lesions are very rare (about fifty cases in the literature) and that the incidence of major complications including avascular necrosis of the proximal fragment, coxa magna and premature epiphyseal fusion is very high. However, an early orthopedic management including soft reduction with X-ray control and fixation by percutaneous kirschner pinning give the best chance for these complications not to occur. Two of the three described in this paper can be considered as a good result after a course of four years. The third case including traumatic separation through the epiphyseal plate with dislocation of the hip and fracture of the femoral head needed a surgical ablation with poor result.