Os trigonum. Variation of a common accessory ossicle of the talus

RW Mann Department of Anthropology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560.

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DW Owsley Department of Anthropology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560.

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The authors present a pictorial essay showing the range of variability of separate and attached os trigona in dry-bone specimens. The presence of free os trigona is found to be 1.7% in an early 20th-century skeletal sample, with no findings of the trait in 513 tali of prehistoric native Americans and Eskimos.

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