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Finite element modelling and experimental validation of a total implanted shoulder joint.

M Bola1, J A Simões2, A Ramos1

  • 1TEMA, Biomechanics Research Group, Department of Mechanical Engineering, University of Aveiro, Portugal, Campo Universitário de Santiago, 3810-193Aveiro.

Computer Methods and Programs in Biomedicine
|May 22, 2021
PubMed
Summary

This study developed a validated finite element model for total shoulder arthroplasty simulation. Experimental validation using strain gauges confirmed the model

Keywords:
Composite bonesExperimental validationFinite element modelShoulder arthroplastyStrain

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Area of Science:

  • Biomechanics
  • Orthopedic Surgery
  • Finite Element Analysis

Background:

  • Replicating total shoulder arthroplasty in laboratory settings is challenging due to complex joint geometry.
  • Existing numerical models for implanted shoulder joints often lack experimental validation.
  • Accurate simulation requires robust models that closely mimic experimental setups.

Purpose of the Study:

  • To develop and validate a finite element model of an implanted total shoulder joint.
  • To compare numerical predictions with experimental strain measurements for model verification.
  • To establish a reliable method for simulating shoulder joint biomechanics.

Main Methods:

  • A non-cemented Anatomical Comprehensive© Total Shoulder System was implanted in composite bone models.
  • A corresponding finite element model was created, incorporating shoulder abduction muscles and identical boundary conditions.
  • Strain gauge rosettes measured experimental strains at 90° abduction for comparison with model outputs.

Main Results:

  • The finite element model demonstrated adequate replication of the experimental setup.
  • Linear regression analysis showed a high correlation (R²=0.945) between numerical and experimental strain data.
  • A root-mean-square error of 35 µε indicated good agreement, with observed posterior-to-anterior load distribution shifts.

Conclusions:

  • Experimental methods successfully validated the developed finite element model for shoulder arthroplasty.
  • Strain gauge measurements are effective for the numerical-experimental validation of bone joint models.
  • The validated model provides a reliable tool for investigating implanted shoulder joint biomechanics.