Calcaneonavicular coalition is best seen on which radiographic view?

• A. AP view
• B. Medial oblique view
• C. Lateral view
• D. Oblique view

Answer: (B)

The key idea is that calcaneonavicular coalitions are easiest to spot when the two bones are viewed in profile with minimal superimposition. The medial oblique view positions the calcaneus and navicular so a bridging bony connection between them stands out, often producing the classic anteater sign—a beak-like projection of the navicular toward the calcaneus. This makes the medial oblique projection the most sensitive view for detecting a calcaneonavicular coalition, especially when the coalition is small or partial. Other views can miss it due to overlapping bones or suboptimal alignment, and a general oblique view is not as reliable as the dedicated medial oblique projection.