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Behavior under Load of A Human Shoulder: Finite Element Simulation and Analysis.

Manuel Islán Marcos1, Emilio Lechosa Urquijo2, Fernando Blaya Haro2

  • 1Escuela Técnica Superior de Ingeniería y Diseño Industrial, Universidad Politécnica de Madrid, Ronda de Valencia, 3, 28012, Madrid, Spain. manuel.islan.marcos@upm.es.

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|April 4, 2019
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Summary

This study models the shoulder joint in 3D for finite element analysis, revealing maximum stress in tendons and cartilage under load. Findings aid understanding of work-related shoulder injuries.

Keywords:
Finite element analysisHumerusLigamentsMusclesShoulderTendons

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Area of Science:

  • Biomechanics
  • Musculoskeletal modeling
  • Computational anatomy

Background:

  • Musculoskeletal injuries, particularly shoulder injuries, are prevalent in occupational settings due to repetitive and sustained movements.
  • Workers in the building sector face high risks from loaded, unnatural shoulder postures during repetitive tasks.

Purpose of the Study:

  • To create a 3D computational model of the shoulder joint's biological components.
  • To perform finite element analysis (FEA) to evaluate stress distribution under various load conditions.

Main Methods:

  • Development of a 3D finite element model of the shoulder joint, including muscles, tendons, and ligaments.
  • Application of a linear and isotropic joint approach for stress evaluation.
  • Utilized 1D elements for modeling joint muscles, enabling analysis of different positions without re-meshing.

Main Results:

  • Maximum stress concentrations were observed in the ligament insertion areas on the bones.
  • Tendons exhibited the highest stress values according to the stress distribution analysis.
  • Cartilage stress distribution showed maximum values in the lower half, correlating with greater humerus-scapula contact and compression.

Conclusions:

  • The finite element model provides a viable method for analyzing shoulder joint mechanics under occupational loads.
  • Results align with biomechanical expectations, identifying critical areas for potential injury in tendons, ligaments, and cartilage.
  • The simplified muscle modeling allows for efficient analysis of various joint positions relevant to sports medicine and occupational health.