X-rays showed avascular necrosis at ten months of age . At two years of age, the ossification of the left nucleus was still delayed. The leg lengths were equal and the range of motion of the hip was full. Coxa valga was also observed. The reported incidence of avascular necrosis has ranged from zero to 73 per cent.
Boys are more susceptible to ischemia than girls.
The subtle signs of physeal involvement were far less obvious than the changes in the ossific nucleus. But it plays a key role in the future development of femoral head deformities. Either delay in the appearance of the ossific nucleus or mottling of the ossific nucleus. With revascularization, there is flattening and fragmentation of the shadow of the ossific nucleus, but the head will usually regain its spherical shape. This is the most common with the best prognosis.