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opensim-modeler

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OpenSim musculoskeletal modeling skill for biomechanical simulation and analysis

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Source SKILL.md: https://github.com/a5c-ai/babysitter/blob/HEAD/library/specializations/domains/science/biomedical-engineering/skills/opensim-modeler/SKILL.md

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OpenSim Modeler Skill

Purpose

The OpenSim Modeler Skill facilitates musculoskeletal modeling and simulation using OpenSim, supporting biomechanical analysis, device design, and clinical research applications.

Capabilities

  • Model scaling to subject anthropometry
  • Inverse kinematics and dynamics
  • Static optimization
  • Computed muscle control
  • Joint reaction analysis
  • Custom model development
  • Prosthetic/orthotic integration
  • Muscle force estimation
  • Metabolic cost prediction
  • Sensitivity analysis
  • Model validation workflows

Usage Guidelines

When to Use

  • Creating subject-specific musculoskeletal models
  • Estimating muscle forces and joint loads
  • Evaluating prosthetic/orthotic designs
  • Supporting surgical planning

Prerequisites

  • Motion capture data available
  • Subject anthropometric measurements
  • Base musculoskeletal model selected
  • Experimental markers defined

Best Practices

  • Validate model scaling with experimental data
  • Assess inverse kinematics residuals
  • Verify physiological muscle activations
  • Document model modifications

Process Integration

This skill integrates with the following processes:

  • Gait Analysis and Musculoskeletal Modeling
  • Orthopedic Implant Biomechanical Testing
  • Clinical Study Design and Execution
  • Human Factors Engineering and Usability

Dependencies

  • OpenSim software
  • MATLAB/Python scripting
  • Motion capture data
  • Musculoskeletal model libraries
  • Computational resources

Configuration

opensim-modeler:
  model-types:
    - lower-extremity
    - upper-extremity
    - full-body
    - spine
  analysis-tools:
    - inverse-kinematics
    - inverse-dynamics
    - static-optimization
    - CMC
    - joint-reaction
  output-variables:
    - muscle-forces
    - joint-moments
    - joint-reactions
    - metabolic-cost

Output Artifacts

  • Scaled musculoskeletal models
  • Kinematics results
  • Muscle force estimates
  • Joint reaction forces
  • Simulation reports
  • Validation metrics
  • Sensitivity analysis results
  • Visualization files

Quality Criteria

  • Model scaling matches subject anthropometry
  • Inverse kinematics residuals acceptable
  • Muscle activations physiologically plausible
  • Joint reactions validated where possible
  • Results reproducible
  • Documentation complete