Trabecular architecture of the great ape and human femoral head

Georgiou, Leoni<sup>1</sup>; Kivell, Tracy L.<sup>1,2</sup>; Pahr, Dieter H.<sup>3,4</sup>; Buck, Laura T.<sup>5</sup>; Skinner, Matthew M.<sup>1,2</sup>

Affiliations

¹Skeletal Biology Research Centre, School of Anthropology and Conservation, University of Kent, Canterbury, UK

²Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany

³Institute for Lightweight Design and Structural Biomechanics, Vienna University of Technology, Vienna, Austria

⁴Department of Anatomy and Biomechanics, Karl Landsteiner Private University of Health Sciences, Krems an der Donau, Austria

⁵Department of Anthropology, University of California, Davis, CA, USA

Abstract and keywords

Studies of femoral trabecular structure have shown that the orientation and volume of bone are associated with variation in loading and could be informative about individual joint positioning during locomotion. In this study, we analyse for the first time trabecular bone patterns throughout the femoral head using a whole‐epiphysis approach to investigate how potential trabecular variation in humans and great apes relates to differences in locomotor modes. Trabecular architecture was analysed using microCT scans of Pan troglodytes (n = 20), Gorilla gorilla (n = 14), Pongo sp. (n = 5) and Homo sapiens (n = 12) in medtool 4.1. Our results revealed differences in bone volume fraction (BV/TV) distribution patterns, as well as overall trabecular parameters of the femoral head between great apes and humans. Pan and Gorilla showed two regions of high BV/TV in the femoral head, consistent with hip posture and loading during two discrete locomotor modes: knuckle‐walking and climbing. Most Pongo specimens also displayed two regions of high BV/TV, but these regions were less discrete and there was more variability across the sample. In contrast, Homo showed only one main region of high BV/TV in the femoral head and had the lowest BV/TV, as well as the most anisotropic trabeculae. The Homo trabecular structure is consistent with stereotypical loading with a more extended hip compared with great apes, which is characteristic of modern human bipedalism. Our results suggest that holistic evaluations of femoral head trabecular architecture can reveal previously undetected patterns linked to locomotor behaviour in extant apes and can provide further insight into hip joint loading in fossil hominins and other primates.

Keywords: African apes; cancellous bone; functional morphology;Gorilla; hominid;Pan;Pongo

Links

DOI: 10.1111/joa.12957

PubMed: 30793309

WoS: 000466523300008

History

Accepted: 2019-01-16

Online: 2019-02-21

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