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In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy

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A validated method for modeling anthropoid hip abduction in silico.

Ashley S Hammond^1,2,3, J Michael Plavcan⁴, Carol V Ward³

¹Center for Advanced Study of Human Paleobiology, Department of Anthropology, George Washington University, Washington, DC, 20052.

American Journal of Physical Anthropology

|April 19, 2016

Summary

This study models hip abduction in anthropoids using 3D bone scans and simulations. The models provide insights into primate locomotion and paleobiology, though with some limitations in accuracy for specific taxa.

Keywords:

hip joint mobility in vivo limb postures model validation primate locomotion

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Area of Science:

Paleobiology
Biomechanics
Primate Anatomy

Background:

Reconstructing fossil primate locomotion and paleobiology relies on understanding hip joint mobility.
Previous methods lacked the precision to accurately model hip joint movement from skeletal remains.

Purpose of the Study:

To present a novel method for modeling hip abduction in anthropoids.
To validate this computational model using in vivo data from live animals.

Main Methods:

Integration of 3D polygonal models from laser scans and 3D landmark data.
Digital articulation and manipulation of the hip joint using shape analysis software.
Comparison of simulated femoral abduction and knee position with published live animal data.

Main Results:

Models accurately estimated knee position and, to a lesser extent, angular abduction across diverse locomotor groups.
Underestimation of abduction occurred in acrobatic/suspensory taxa; overestimation in stereotyped taxa.
Correspondence between in vivo and in silico data varied at specific and generic levels.

Conclusions:

The developed models broadly align with in vivo hip abduction data, but the relationship is complex.
Models can predict locomotor adaptations (acrobatic/stereotyped) near the extremes of abduction ability.
Validating computational models with in vivo data is crucial for understanding extinct primate functional abilities.