Trabecular architecture of the capitate and third metacarpal through ontogeny in chimpanzees (Pan troglodytes) and gorillas (Gorilla gorilla)

Ragni, Anna J.

doi:10.1016/j.jhevol.2019.102702

Cited by 16 publications

(43 citation statements)

References 102 publications

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“…The positive relationship found in BV/TV does not corroborate results of either previous study on allometry in the primate capitate (Ragni, 2020;Schilling et al, 2014) or the talus (Tsegai et al, 2017). Differences in results between this study and others may be driven by the variation in the methodologies for calculating size or body mass.…”

Section: Allometry In the Capitatecontrasting

confidence: 99%

“…Bone functional adaptation research cannot only facilitate a greater understanding of the joint loading and kinematics of extant species but may also provide an informative avenue for behavioral reconstruction in fossil taxa (DeSilva & Devlin, 2012 ; Dunmore et al, 2020 ; Georgiou et al, 2020 ; Griffin et al, 2010 ; Kivell et al, 2018 ; Skinner et al, 2015 ; Su & Carlson, 2017 ). Previous studies of primate trabecular bone structure within the capitate have used a volume of interest (VOI) sampling sphere but have found limited functional correlation with locomotor behavior (Ragni, 2020 ; Schilling et al, 2014 ). However, using a whole epiphysis/bone methodology has been more functionally informative for hand bone studies (Dunmore et al, 2019 ; Stephens et al, 2016 , 2018 ; Tsegai et al, 2013 , 2017 ).…”

Section: Introductionmentioning

confidence: 99%

“…As functional adaptation research aims to identify markers of behavior rather than body size, analyzing bone parameters for allometric effects has been integral to interspecific analyses (Ruff, 1984 ). Decades of research across various species has yet to find consistent patterns; however, some research suggests there may be a general pattern across mammals and birds whereby bone volume to total volume (BV/TV) and degree of anisotropy (DA) are independent of body mass (Barak et al, 2013 ; Christen et al, 2015 ; Cotter et al, 2009 ; Doube et al, 2011 ; Kivell et al, 2018 ; Komza & Skinner, 2019 ; Schilling et al, 2014 ; Tsegai et al, 2017 ) while trabecular thickness (Tb.Th), trabecular number (Tb.N) and trabecular separation (Tb.Sp) scale with negative allometry (Barak et al, 2013 ; Kivell et al, 2018 ; Ragni, 2020 ; Ryan & Shaw, 2013 ). Cortical thickness (Ct.Th) is often reported to be isometric or slightly positively allometric (Demes et al, 2000 ; Fajardo et al, 2013 ; Runestad, 1997 ).…”

Section: Introductionmentioning

confidence: 99%

“…Cortical thickness (Ct.Th) is often reported to be isometric or slightly positively allometric (Demes et al, 2000 ; Fajardo et al, 2013 ; Runestad, 1997 ). However, not all studies find BV/TV and DA to be independent of body mass (for example Fajardo et al, 2013 ; Mielke et al, 2018 ; Ragni, 2020 ; Ryan & Shaw, 2013 ) nor the negative relationship with Tb.Th, Tb.N and Tb.Sp (for example Doube et al, 2011 ; Fajardo et al, 2013 ; Komza & Skinner, 2019 ; Tsegai et al, 2017 ) Few allometric studies have been undertaken on short bones. Tsegai et al ( 2017 ) found no correlation between trabecular parameters or Ct.Th with size in intraspecific analyses of the Homo and Pan talus.…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, an interspecific analysis in Schilling et al ( 2014 ) of the primate capitate found only Tb.N to scale with negative allometry. Ragni ( 2020 ) found a greater number of significant relationships within the capitate of Pan and Gorilla with Tb.Th, Tb.N, and Tb.Sp showing negative allometry and DA and BV/TV expressing isometry. These conflicting results may be due in part to methodological differences for sampling trabeculae or calculating size.…”

Section: Introductionmentioning

confidence: 99%

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Cortical and trabecular bone structure of the hominoid capitate

2021

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Section: Allometry In the Capitatecontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cortical and trabecular bone structure of the hominoid capitate

2021

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

Bird

Kivell

Skinner

2021

American Journal of Biological Anthropology

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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 joints have been loaded during the lifetime of an individual.Using a broad sample of extant great apes and humans (n = 177 total bones), 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 that broad patterns in BV/TV and DA differentiate 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.Objectives: Functional adaptation in the trabecular and cortical bone of individual wrist bones has been investigated across hominoid species but functional conclusions remain limited. This study examines whether relative patterns in internal bone architecture across multiple carpal bones can be correlated to the known or assumed kinetics and kinematics of the wrist joint in extant hominoids. Materials and Methods: This study applied a whole-bone methodology to quantify the internal architecture (cortical and trabecular bone) of the scaphoid, lunate, and triquetrum of suspensory (Pongo sp.), knuckle-walking (Pan paniscus, Pan troglodytes, Gorilla sp.) and bipedal (Homo sapiens) hominoids (n = 177 total bones).Results: H. sapiens showed unique patterns in both measured parameters: a decrease in degree of anisotropy (DA) from the scaphoid to the triquetrum with higher bone volume to total volume (BV/TV) in the lunate relative to the other bones. Knuckle-

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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

Bird

Kivell

Dunmore

et al. 2023

American Journal of Biological Anthropology

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ObjectivesThis 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).Materials and MethodsWe 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).ResultsHomo 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.ConclusionThe 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.

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Trabecular architecture of the capitate and third metacarpal through ontogeny in chimpanzees (Pan troglodytes) and gorillas (Gorilla gorilla)

Cited by 16 publications

References 102 publications

Cortical and trabecular bone structure of the hominoid capitate

Cortical and trabecular bone structure of the hominoid capitate

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

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

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