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Related Experiment Video

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A simulation framework for humeral head translations.

Ehsan Sarshari1, Alain Farron2, Alexandre Terrier3

  • 1Automatic Control Laboratory, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 9, CH-1015 Lausanne, Switzerland; Laboratory of Biomechanical Orthopedics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland.

Medical Engineering & Physics
|September 12, 2017
PubMed
Summary

This study introduces a new forward-dynamics simulation framework to predict humeral head translations (HHT) in the glenohumeral (GH) joint. The model incorporates deformable articular contact for accurate HHT prediction during shoulder abduction.

Keywords:
Deformable articular contactForward-dynamics simulationGlenohumeral jointHumeral head translationsShoulder musculoskeletal model

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Area of Science:

  • Biomechanics
  • Musculoskeletal Modeling
  • Orthopedics

Background:

  • Humeral head translations (HHT) are critical for glenohumeral (GH) joint function.
  • Existing inverse dynamics shoulder models struggle to accurately predict HHT.

Purpose of the Study:

  • To develop a novel simulation framework for forward-dynamics simulation of a 6-DOF GH joint musculoskeletal model.
  • To provide a direct solution for predicting HHT within a forward-dynamics approach.

Main Methods:

  • Implemented a forward-dynamics simulation framework for a 6-DOF GH joint musculoskeletal model.
  • Incorporated a deformable articular contact model to define GH joint contact forces based on kinematics.
  • Simulated an abduction motion in the scapular plane.

Main Results:

  • The framework predicts superior-posterior translation of the humeral head, followed by inferior migration.
  • Quantified HHT, GH joint contact forces, contact areas, contact pressure, and cartilage strain.

Conclusions:

  • The developed simulation framework enables accurate prediction of HHT.
  • Inclusion of deformable articular contact is essential for HHT prediction in forward-dynamics simulations.