Mann R W, Owsley D W
Department of Anthropology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560.
J Am Podiatr Med Assoc. 1990 Oct;80(10):536-9. doi: 10.7547/87507315-80-10-536.
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.
作者展示了一篇图片文章，呈现了干骨标本中分离的和附着的骰骨的变异范围。在20世纪早期的骨骼样本中，游离骰骨的出现率为1.7%，在513例史前美洲原住民和爱斯基摩人的距骨中未发现该特征。
