High-resolution computed tomography images were acquired for 31 proximal human tibiae, age 8 to 3... more High-resolution computed tomography images were acquired for 31 proximal human tibiae, age 8 to 37.5 years, from Norris Farms #36 cemetery site (A.D. 1300). Morphometric analysis of subchondral cortical and trabecular bone architecture was performed between and within the tibial condyles. Kruskal–Wallis and Wilcoxon signed-rank tests were used to examine the association between region, age, body mass, and each morphometric parameter. The findings indicate that age-related changes in mechanical loading have varied effects on subchondral bone morphology. With age, trabecular microstructure increased in bone volume fraction (p = 0.033) and degree of anisotropy (p = 0.012), and decreased in connectivity density (p = 0.001). In the subchondral cortical plate, there was an increase in thickness (p < 0.001). When comparing condylar regions, only degree of anisotropy differed (p = 0.004) between the medial and lateral condyles. Trabeculae in the medial condyle were more anisotropic than ...
The analysis of cortical and trabecular bone development morphology offers a lens through which g... more The analysis of cortical and trabecular bone development morphology offers a lens through which general biological processes of skeletal ontogeny can be viewed. These, in turn, establish a foundation upon which biocultural reconstructions of childhood can proceed. In this chapter, the authors draw on skeletal data generated by their systematic cortical and trabecular bone research agenda from a Norris Farms’ archaeological skeletal collection using high resolution microCT imaging combined with new, age-segmented, gait data from extant children. The age-related changes in bone structure, geometry, and architecture are linked to the development of biomechanical competence over the course of three significant transitions in a human’s life course. This chapter identifies transitions and variations in human skeletal biology, skeletal morphology, and bipedal gait as dynamic records of development. These types of ontogenetic studies provide empirical data, which function as a portal to add...
Anatomical record (Hoboken, N.J. : 2007), Jun 22, 2017
Many studies have noted that the bones of the human upper limb display bilateral asymmetry, commo... more Many studies have noted that the bones of the human upper limb display bilateral asymmetry, commonly linking this asymmetry in external and internal morphology to handedness and lateralization. Few studies, however, have attempted to track asymmetry throughout ontogeny. This study assesses the ontogenetic development of cortical and trabecular bone asymmetry in the humerus. We predict that directional asymmetry in structural properties will emerge in concert with hand preference and increased activity levels during the juvenile period. Paired humeri from 57 individuals from the Norris Farms #36 archaeological skeletal collection ranging in age from neonate to adult were used in the current study. Cortical bone cross-sectional properties and three-dimensional trabecular bone structure were quantified from microCT data. The results indicate significant absolute asymmetry in all measured cortical and trabecular bone variables across all ages. Trabecular bone displays significantly high...
Ontogenetic growth processes in human long bones are key elements, determining the variability of... more Ontogenetic growth processes in human long bones are key elements, determining the variability of adult bone structure. This study seeks to identify and describe the interaction between ontogenetic growth periods and changes in femoral and tibial diaphyseal shape. Femora and tibiae (n = 46) ranging developmentally from neonate to skeletally mature were obtained from the Norris Farms No. 36 archeological skeletal series. High-resolution X-ray computed tomography scans were collected. Whole-diaphysis cortical bone drift patterns and relative bone envelope modeling activity across ages were assessed in five cross-sections per bone (total bone length: 20%, 35%, 50%, 65%, and 80%) by measuring the distance from the section centroid to the endosteal and periosteal margins in eight sectors using ImageJ. Pearson correlations were performed to document and interpret the relationship between the cross-sectional shape (Imax /Imin ), total subperiosteal area, cortical area, and medullary cavity...
Because physical anthropology seeks to understand biological aspects of human and non-human prima... more Because physical anthropology seeks to understand biological aspects of human and non-human primates, past and present, its research often involves the analysis of skeletal remains. Bioarchaeologists, paleontologists, forensic anthropologists, and paleopathol-ogists ...
High-resolution computed tomography images were acquired for 31 proximal human tibiae, age 8 to 3... more High-resolution computed tomography images were acquired for 31 proximal human tibiae, age 8 to 37.5 years, from Norris Farms #36 cemetery site (A.D. 1300). Morphometric analysis of subchondral cortical and trabecular bone architecture was performed between and within the tibial condyles. Kruskal–Wallis and Wilcoxon signed-rank tests were used to examine the association between region, age, body mass, and each morphometric parameter. The findings indicate that age-related changes in mechanical loading have varied effects on subchondral bone morphology. With age, trabecular microstructure increased in bone volume fraction (p = 0.033) and degree of anisotropy (p = 0.012), and decreased in connectivity density (p = 0.001). In the subchondral cortical plate, there was an increase in thickness (p < 0.001). When comparing condylar regions, only degree of anisotropy differed (p = 0.004) between the medial and lateral condyles. Trabeculae in the medial condyle were more anisotropic than ...
The analysis of cortical and trabecular bone development morphology offers a lens through which g... more The analysis of cortical and trabecular bone development morphology offers a lens through which general biological processes of skeletal ontogeny can be viewed. These, in turn, establish a foundation upon which biocultural reconstructions of childhood can proceed. In this chapter, the authors draw on skeletal data generated by their systematic cortical and trabecular bone research agenda from a Norris Farms’ archaeological skeletal collection using high resolution microCT imaging combined with new, age-segmented, gait data from extant children. The age-related changes in bone structure, geometry, and architecture are linked to the development of biomechanical competence over the course of three significant transitions in a human’s life course. This chapter identifies transitions and variations in human skeletal biology, skeletal morphology, and bipedal gait as dynamic records of development. These types of ontogenetic studies provide empirical data, which function as a portal to add...
Anatomical record (Hoboken, N.J. : 2007), Jun 22, 2017
Many studies have noted that the bones of the human upper limb display bilateral asymmetry, commo... more Many studies have noted that the bones of the human upper limb display bilateral asymmetry, commonly linking this asymmetry in external and internal morphology to handedness and lateralization. Few studies, however, have attempted to track asymmetry throughout ontogeny. This study assesses the ontogenetic development of cortical and trabecular bone asymmetry in the humerus. We predict that directional asymmetry in structural properties will emerge in concert with hand preference and increased activity levels during the juvenile period. Paired humeri from 57 individuals from the Norris Farms #36 archaeological skeletal collection ranging in age from neonate to adult were used in the current study. Cortical bone cross-sectional properties and three-dimensional trabecular bone structure were quantified from microCT data. The results indicate significant absolute asymmetry in all measured cortical and trabecular bone variables across all ages. Trabecular bone displays significantly high...
Ontogenetic growth processes in human long bones are key elements, determining the variability of... more Ontogenetic growth processes in human long bones are key elements, determining the variability of adult bone structure. This study seeks to identify and describe the interaction between ontogenetic growth periods and changes in femoral and tibial diaphyseal shape. Femora and tibiae (n = 46) ranging developmentally from neonate to skeletally mature were obtained from the Norris Farms No. 36 archeological skeletal series. High-resolution X-ray computed tomography scans were collected. Whole-diaphysis cortical bone drift patterns and relative bone envelope modeling activity across ages were assessed in five cross-sections per bone (total bone length: 20%, 35%, 50%, 65%, and 80%) by measuring the distance from the section centroid to the endosteal and periosteal margins in eight sectors using ImageJ. Pearson correlations were performed to document and interpret the relationship between the cross-sectional shape (Imax /Imin ), total subperiosteal area, cortical area, and medullary cavity...
Because physical anthropology seeks to understand biological aspects of human and non-human prima... more Because physical anthropology seeks to understand biological aspects of human and non-human primates, past and present, its research often involves the analysis of skeletal remains. Bioarchaeologists, paleontologists, forensic anthropologists, and paleopathol-ogists ...
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