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Footloose: Articular surface morphology and joint movement potential in the ankles of lorisids and cheirogaleids.

Publication ,  Journal Article
Yapuncich, GS; Granatosky, MC
Published in: Am J Phys Anthropol
August 2021

OBJECTIVES: The competing functional demands of diarthrodial joints, permitting mobility while retaining enough stability to transmit forces across the joint, have been linked with the shape and size of the joint's articular surfaces. A clear understanding of the relationship between joint morphology and joint movement potential is important for reconstructing locomotor behaviors in fossil taxa. METHODS: In a sample of matched tali and calcanei of lorisids (n = 28) and cheirogaleids (n = 38), we quantify the surface areas of the talar and calcaneal ectal (=posterior talocalcaneal) articular surfaces and model the principal curvatures of these surfaces with quadric formulas. These two taxonomic groups have similar body masses, but differ substantially in positional behavior, so that differences in joint surface morphology should reflect adaptive demands of their locomotor behavior. RESULTS: Compared with cheirogaleids, lorisids exhibit: (a) a significantly greater area difference between their paired joint surfaces; and (b) a more pronounced saddle shape for the talar ectal facet. CONCLUSION: The increased subtalar joint mobility observed in lorisids may be achieved by increasing the amount of sliding and rolling that can occur at the subtalar joint. The subtalar joint morphology observed in two fossil euarchontans, the plesiadapiforms Purgatorius sp. and Plesiadapis cookei, compares favorably with the morphology observed among lorisids, potentially suggesting antipronograde postures within these extinct taxa.

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Published In

Am J Phys Anthropol

DOI

EISSN

1096-8644

Publication Date

August 2021

Volume

175

Issue

4

Start / End Page

876 / 894

Location

United States

Related Subject Headings

  • Subtalar Joint
  • Posture
  • Fossils
  • Calcaneus
  • Anthropology
  • Ankle
  • 4401 Anthropology
  • 4301 Archaeology
  • 3103 Ecology
  • 2101 Archaeology
 

Citation

APA
Chicago
ICMJE
MLA
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Yapuncich, G. S., & Granatosky, M. C. (2021). Footloose: Articular surface morphology and joint movement potential in the ankles of lorisids and cheirogaleids. Am J Phys Anthropol, 175(4), 876–894. https://doi.org/10.1002/ajpa.24298
Yapuncich, Gabriel S., and Michael C. Granatosky. “Footloose: Articular surface morphology and joint movement potential in the ankles of lorisids and cheirogaleids.Am J Phys Anthropol 175, no. 4 (August 2021): 876–94. https://doi.org/10.1002/ajpa.24298.
Yapuncich GS, Granatosky MC. Footloose: Articular surface morphology and joint movement potential in the ankles of lorisids and cheirogaleids. Am J Phys Anthropol. 2021 Aug;175(4):876–94.
Yapuncich, Gabriel S., and Michael C. Granatosky. “Footloose: Articular surface morphology and joint movement potential in the ankles of lorisids and cheirogaleids.Am J Phys Anthropol, vol. 175, no. 4, Aug. 2021, pp. 876–94. Pubmed, doi:10.1002/ajpa.24298.
Yapuncich GS, Granatosky MC. Footloose: Articular surface morphology and joint movement potential in the ankles of lorisids and cheirogaleids. Am J Phys Anthropol. 2021 Aug;175(4):876–894.
Journal cover image

Published In

Am J Phys Anthropol

DOI

EISSN

1096-8644

Publication Date

August 2021

Volume

175

Issue

4

Start / End Page

876 / 894

Location

United States

Related Subject Headings

  • Subtalar Joint
  • Posture
  • Fossils
  • Calcaneus
  • Anthropology
  • Ankle
  • 4401 Anthropology
  • 4301 Archaeology
  • 3103 Ecology
  • 2101 Archaeology