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Fig. 2B. —Lateral radiographs used to evaluate calcaneonavicular coalition. Lateral radiograph of 18-year-old man with severe flexible flatfoot shows normal anterior process for comparison with A. Because of flatfoot deformity, anterior process of calcaneus overlies neck of talus. Despite alteration of normal anatomic relationships between talus and calcaneus, anterior process of calcaneus forms short triangle with sharp tip (arrow).