Evidence map›Paper›PMID 29610309›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2018

Hip extensor mechanics and the evolution of walking and climbing capabilities in humans, apes, and fossil hominins.

Elaine E Kozma, Nicole M Webb, William E H Harcourt-Smith, David A Raichlen, Kristiaan D'Août, Mary H Brown, Emma M Finestone, Stephen R Ross, Peter Aerts, Herman Pontzer

Abstract readComparative Study
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 22 papers.

0numbers the graph read from it
0cells of the map it votes in
22citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

22 citing papers in PubMed.

  1. Environmental Context of Hominin Foot Evolution.American journal of biological anthropology · 2026
    Article
  2. Article
  3. Article
  4. Article
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  6. Article
  7. Trabecular Architecture of the Proximal Tibia in Extant Hominids.American journal of biological anthropology · 2025
    Article
  8. Article
  9. Article
  10. Article
  11. Article
  12. Article
  13. Ape femoral-humeral rigidities and arboreal locomotion.American journal of biological anthropology · 2022
    Article
  14. Article
  15. Pathways to primate hip function.Royal Society open science · 2022
    Article
  16. Review
  17. Reconstructing Articular Cartilage in theIntegrative organismal biology (Oxford, England) · 2022
    Article
  18. Science advances · 2021
    Article
  19. Review
  20. Insights into the lower torso in late Miocene hominoidProceedings of the National Academy of Sciences of the United States of America · 2020
    Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

10 authors.

Elaine E KozmaGraduate Center, City University of New York, New York, NY 10016; ekozma@gradcenter.cuny.edu hpontzer@hunter.cuny.edu.
Nicole M WebbGraduate Center, City University of New York, New York, NY 10016.
William E H Harcourt-SmithGraduate Center, City University of New York, New York, NY 10016.
David A RaichlenSchool of Anthropology, University of Arizona, Tucson, AZ 85721.
Kristiaan D'AoûtInstitute of Ageing and Chronic Disease, University of Liverpool, Liverpool L7 8TX, United Kingdom.ORCID 0000-0002-6043-7744
Mary H BrownLester E. Fisher Center for the Study and Conservation of Apes, Lincoln Park Zoo, Chicago, IL 60614.ORCID 0000-0003-3974-0172
Emma M FinestoneGraduate Center, City University of New York, New York, NY 10016.
Stephen R RossLester E. Fisher Center for the Study and Conservation of Apes, Lincoln Park Zoo, Chicago, IL 60614.
Peter AertsDepartment of Biology, University of Antwerp, 2610 Antwerp, Belgium.
Herman PontzerGraduate Center, City University of New York, New York, NY 10016; ekozma@gradcenter.cuny.edu hpontzer@hunter.cuny.edu.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The evolutionary emergence of humans' remarkably economical walking gait remains a focus of research and debate, but experimentally validated approaches linking locomotor capability to postcranial anatomy are limited. In this study, we integrated 3D morphometrics of hominoid pelvic shape with experimental measurements of hip kinematics and kinetics during walking and climbing, hamstring activity, and passive range of hip extension in humans, apes, and other primates to assess arboreal-terrestrial trade-offs in ischium morphology among living taxa. We show that hamstring-powered hip extension during habitual walking and climbing in living apes and humans is strongly predicted, and likely constrained, by the relative length and orientation of the ischium. Ape pelves permit greater extensor moments at the hip, enhancing climbing capability, but limit their range of hip extension, resulting in a crouched gait. Human pelves reduce hip extensor moments but permit a greater degree of hip extension, which greatly improves walking economy (i.e., distance traveled/energy consumed). Applying these results to fossil pelves suggests that early hominins differed from both humans and extant apes in having an economical walking gait without sacrificing climbing capability.

Indexed as

AdultAnatomy, ComparativeAnimalsAnthropometryBiological EvolutionBiomechanical PhenomenaFossilsGaitHamstring MusclesHipHominidaeHumansHylobatidaeMalePelvisPostureevolutionhomininischiumlocomotionpelvis

Identifiers

PMID29610309
PMCPMC5910817

What OpenQuestion holds

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LicenceCC BY-NC-ND
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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.