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Fig. 2A —First metatarsal head osseous anatomy. Three-dimensional reformatted CT image (A) and corresponding gross specimen (B) of dorsal aspect of first metatarsal head show elevated osseous crest (black arrowheads) and osseous ridge (straight black arrows) separated by intervening shallow concavity (curved arrow). Osseous crest and ridge correspond to attachment sites for redundant joint capsule. Medial and lateral tubercles are also evident (white arrows).