Fig. 2

Radiographic images of children with achondroplasia at the ages of 4 (A and C) and 8 years (B and D). A-B Note squared configuration of the pelvis that remains with the years, as well as the narrowness of the sciatic notch. The femoral neck became short. In the lower long bones, the irregularity of metaphysis of the knees shows, with the age, the “chevron” shape of the distal region of femora. C-D The tibia is broad and the fibulae greater than the tibia