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Fig. 4 —Cross-sectional schematic at level of first metatarsophalangeal joint further illustrates normal osseous contours of first metatarsal head that simulate erosive changes. Again, these include sharp osseous groove (A) between medial and lateral tubercles (B) and centralized medial and lateral osseous concavities (C) themselves. Bilateral convex osseous prominences (D) provide gradual transition from medial and lateral aspect to plantar aspect. Intersesamoidal ridge (E) separates medial and lateral plantar concavities, which articulate with medial and lateral sesamoid bones, respectively.