Radiological lateral view of an “early stage III” adult-acquired flatfoot who underwent a Koutsogiannis’ osteotomy preoperatively and at follow-up 24 months after surgery. Lateral view pre- and postoperatively (’): (1) calcaneal pitch and (2) naviculocuboid overlap measured as the overlapped image (short line) divided with the height of the cuboid (long line). Anteroposterior view showing the talonavicular coverage.