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Bones of the Lower Limb: Femur and Patella01:16

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The femur is the body's longest and strongest bone spanning the thigh region. Its head articulates with the acetabulum of the hip bone to form the hip joint. A minor indentation on the medial side of the femoral head, called the fovea capitis, serves as the site of attachment for the ligament of the head of the femur. This weak ligament spans the femur and acetabulum and supports the hip joint. The narrowed region below the head is the neck of the femur. The inclination angle between the...
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Technical Note: Using Machine Learning to Predict Locomotor Behavior in Great Apes and Humans From Femur Metaphyseal

Peter A Stamos1, Abhijit J Chaudhari2, Mark N Grote1

  • 1Department of Anthropology, University of California, Davis, Davis, California, USA.

American Journal of Biological Anthropology
|June 4, 2025
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Summary

The distal femur

Keywords:
bipedalismclimbingknuckle‐walkingmorphometricsontogeny

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Area of Science:

  • Paleoanthropology
  • Biomechanics
  • Evolutionary Biology

Background:

  • The distal femoral metaphyseal surface morphology in hominoids is known to reflect locomotor behaviors across developmental stages.
  • Previous qualitative assessments suggest a link between femur shape and locomotion.

Purpose of the Study:

  • To quantitatively assess the predictive relationship between distal femoral metaphyseal surface morphology and locomotor behaviors in hominoids.
  • To evaluate the accuracy of machine learning models in predicting locomotion from femur morphology.

Main Methods:

  • Collected 3D surface laser scans of femora from 177 human and great ape individuals across subadult development.
  • Utilized the landmark-free Global Point Signature (GPS) method to quantify metaphyseal surface shape.
  • Applied support vector machines (SVMs) to analyze GPS data and predict locomotor behavior.

Main Results:

  • Metaphyseal surface morphology is a strong predictor of hominoid locomotor behavior.
  • The SVM model achieved approximately 84% out-of-sample predictive accuracy for nonambulation, bipedal walking, knuckle-walking, and climbing.

Conclusions:

  • Quantitative analysis confirms the high predictability of distal femur morphology for locomotor behavior throughout hominoid ontogeny.
  • The distal femur's metaphyseal surface is a valuable skeletal region for reconstructing the locomotor behaviors of extinct hominoids.