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Patterns of internal bone structure and functional adaptation in the hominoid scaphoid, lunate, and triquetrum

Bird, Emma E., Kivell, Tracy L., Skinner, Matthew M. (2021) Patterns of internal bone structure and functional adaptation in the hominoid scaphoid, lunate, and triquetrum. American Journal of Biological Anthropology, 177 (2). pp. 266-285. (doi:10.1002/ajpa.24449) (Access to this publication is currently restricted. You may be able to access a copy if URLs are provided) (KAR id:92552)

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The morphology of the proximal carpals (scaphoid, lunate, triquetrum) are linked to the range of motion (ROM) at the radiocarpal and midcarpal joints. While the relationship between ROM and habitual locomotor mode is well established, it has yet to be investigated whether relative patterns of internal bone architecture reflect the kinematics and kinetics at the proximal row. As internal bone is known to model its structure to habitually incurred forces, internal architecture has the potential to provide insight into how a joint(s) have been loaded during the lifetime of an individual. Using a broad sample of extant great apes and humans (n=177 total), this study investigates whether relative differences in the bone volume to total volume (BV/TV) and degree of anisotropy (DA) across the scaphoid, lunate and triquetrum correlate with the presumed force transfer and biomechanics of the hominoid wrist. Results reveal broad patterns in BV/TV and DA differentiated hominoids by their predominant locomotor mode. The human pattern suggests the lunate may be the most highly strained bone within the proximal row. Both knuckle-walking taxa (Gorilla, Pan) exhibited similar architectural patterns suggesting they are adapted to resist similar forces in this region of the wrist. The relatively high DA across all Pongo carpals suggests it may have more stereotypical wrist loading than commonly assumed. Finally, the distinctly low DA in the triquetrum across all taxa suggests force transfer via the synapomorphic Triangular Fibrocartilage Complex may leave a distinctive signature in the internal bone architecture that requires further investigation.

Item Type: Article
DOI/Identification number: 10.1002/ajpa.24449
Uncontrolled keywords: ape locomotion, cortical bone, radiocarpal, trabecular bone, wrist
Subjects: H Social Sciences
Divisions: Divisions > Division of Human and Social Sciences > School of Anthropology and Conservation
Depositing User: Emma Bird
Date Deposited: 05 Jan 2022 13:19 UTC
Last Modified: 10 Nov 2023 12:36 UTC
Resource URI: (The current URI for this page, for reference purposes)

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