Trabecular bone structure of the proximal capitate in extant hominids and fossil hominins with implications for midcarpal joint loading and the dart-thrower's motion.
African apes
Australopithecus
cancellous bone
fossil Homo
wrist
Journal
American journal of biological anthropology
ISSN: 2692-7691
Titre abrégé: Am J Biol Anthropol
Pays: United States
ID NLM: 101770171
Informations de publication
Date de publication:
26 Jul 2023
26 Jul 2023
Historique:
revised:
05
05
2023
received:
12
10
2022
accepted:
10
07
2023
medline:
26
7
2023
pubmed:
26
7
2023
entrez:
26
7
2023
Statut:
aheadofprint
Résumé
This research examines whether the distribution of trabecular bone in the proximal capitates of extant hominids, as well as several fossil hominin taxa, is associated with the oblique path of the midcarpal joint known as the dart-thrower's motion (DTM). We analyzed proximal capitates from extant (Pongo n = 12; Gorilla n = 11; Pan n = 10; fossil and recent Homo sapiens n = 29) and extinct (Australopithecus sediba n = 2; Homo naledi n = 1; Homo floresiensis n = 2; Neandertals n = 3) hominids using a new canonical holistic morphometric analysis, which quantifies and visualizes the distribution of trabecular bone using relative bone volume as a fraction of total volume (rBV/TV). Homo sapiens and Neandertals had a continuous band of high rBV/TV that extended across the scaphoid, lunate, and hamate subarticular regions, but other fossil hominins and extant great apes did not. A. sediba expressed a distinct combination of human-like and Pan-like rBV/TV distribution. Both H. floresiensis and H. naledi had high rBV/TV on the ulnar-side of the capitate but low rBV/TV on the radial-side. The proximal capitates of H. sapiens and Neandertals share a distinctive distribution of trabecular bone that suggests that these two species of Homo regularly load(ed) their midcarpal joints along the full extent of the oblique path of the DTM. The observed pattern in A. sediba suggests that human-like stress at the capito-scaphoid articular surface was combined with Pan-like wrist postures, whereas the patterns in H. floresiensis and H. naledi suggest their midcarpal joints were loaded differently from that of H. sapiens and Neandertals.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Subventions
Organisme : FP7 European Research Council Starting Grant
ID : 336301
Organisme : European Union's Horizon 2020 research and innovation programme
ID : 819960
Organisme : ERC-SSHRC Visiting Scholar Program and SSHRC Insight Grant
ID : 435-2017-1234
Organisme : The Max Planck Society
Organisme : University of Kent
Organisme : The Calleva Foundation
Informations de copyright
© 2023 The Authors. American Journal of Biological Anthropology published by Wiley Periodicals LLC.
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