Developmental anomalies of the skeleton are often treated as mere curiosities, but in some contexts, they may prove useful to bioarchaeologists for answering questions about the past. One such use can be found in skeletal kinship analysis, where discrete traits can help to identify close genetic relatives in archaeological cemeteries. Previous research suggests that discrete traits used for skeletal kinship analysis should have several characteristics-they must obviously be heritable, but in addition, they should be easy to score as present or absent, their frequencies should not vary by age or sex, and they should be low frequency traits. Low frequency traits are less likely than higher frequency traits to be found in two individuals merely by chance. In this study, we consider 17 developmental anomalies of the human foot as candidates for use in skeletal kinship analysis. The traits are evaluated in terms of the characteristics described above, after which kinship analyses are attempted on two different populations. Ten of the anomalies are found to be good candidates for skeletal kinship analysis, including accessory navicular, four different forms of brachydactyly, three types of tarsal coalition, and two forms of the os intermetatarseum. When frequencies of these traits were examined and compared to a reference sample in three cemeteries, however, only a single group of six possible genetic relatives were identified. The results suggest that skeletal kinship analysis using individual heritable traits is perhaps best applied to small cemeteries or burial clusters rather than larger cemeteries containing many different lineages.
The accessory navicular is a supernumerary bone of the human foot located medial to the navicular tuberosity and represents a secondary center of ossification that has failed to fuse to the main body of the navicular. Three forms of the accessory bone have been identified: Type I is an independent ossicle that is often embedded within the tibialis posterior tendon; Type II is a triangular accessory bone that attaches to the navicular tuberosity by means of a cartilaginous or fibrocartilaginous bridge; and Type III represents a fused Type II, which forms a hook-like protuberance extending from the tuberosity. The Type II accessory navicular is the most common of the three forms and is the most readily identifiable in skeletal material since it causes the navicular tuberosity to become abnormally flattened and porous. The purpose of this study was to describe the various manifestations of the accessory navicular in dry bone, to present and compare frequency data for several skeletal populations, and to consider questions of laterality and sex bias in trait expression. In total, the skeletons of 497 Danes, 460 Euro-Americans, 300 African Americans, 100 Japanese, and 205 Europeans were examined for the presence of the Type II accessory navicular. Overall frequencies for the five groups ranged from 2% in the African American sample to 5% in the Japanese sample. Since several family pedigrees have documented the accessory navicular as being an inherited skeletal defect, the relatively low frequency found in the present study makes this trait a potentially useful indicator of genetic relatedness within archaeological cemeteries. In addition, the trait was found to occur more often unilaterally than bilaterally and there was nearly equal incidence among males and females.
The biocultural effects of European contact varied considerably throughout the Americas. Some populations were decimated by colonialism, while others benefited from trade relationships and access to new technologies. It has been suggested that initial contact with European fur traders and explorers was economically favourable for Plains village populations, thereby facilitating a period of cultural florescence. In this study, we evaluate the hypothesis that Plains groups were better off than their predecessors during the initial contact period by comparing frequencies of enamel hypoplasia, cribra orbitalia, and porotic hyperostosis in pre-and post-contact Arikara skeletal assemblages. We included both juveniles and adults in our sample to capture variation in the stress experience of different segments of the population. Our analysis revealed similarly low frequencies of cribra orbitalia in the pre-and post-contact groups and no observed cases of porotic hyperostosis. Enamel hypoplasia, however, was significantly more prevalent among post-contact Arikara villagers when compared to their pre-contact counterparts, which suggests that stress levels were higher after European contact. Additionally, enamel hypoplasia was most common among post-contact juveniles. The elevated frequency of enamel hypoplasia in the post-contact sample combined with the low frequencies of cribra orbitalia and porotic hyperostosis suggests that disease stress, rather than nutritional deficiencies, was likely responsible for the decline in overall health following European contact. These results also suggest that juveniles are sensitive indicators of systemic stress within a population and should be included in bioarchaeological analyses of prehistoric health when available.
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