Os trigonum. Variation of a common accessory ossicle of the talus.
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.
Mann
R W
RW
Department of Anthropology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560.
Owsley
D W
DW
D000328:Adult; D006801:Humans; D013628:Talus / Q000002:abnormalities / Q000033:anatomy & histology*