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Fig. 3B —Cross-sectional depiction of first metatarsal head at level of first metatarsophalangeal joint. CT scan (A), high-resolution radiograph (B), and gross specimen (C) show normal osseous contours that simulate erosive change. These include sharp osseous groove (A) between medial and lateral tubercles (B) and centralized medial and lateral osseous concavities (C). Bilateral convex osseous prominences (D) provide gradual transition from medial and lateral aspect to plantar surface. Intersesamoidal ridge (E) separates medial and lateral plantar concavities, which articulate with medial and lateral sesamoid bones, respectively. Note smooth convex dorsal surface is devoid of osseous protuberances or depressions.