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Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion
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OpenSim Moco: Musculoskeletal optimal control.

Christopher L Dembia1, Nicholas A Bianco1, Antoine Falisse2,3

  • 1Department of Mechanical Engineering, Stanford University, Stanford, California, United States of America.

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|December 28, 2020
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Summary
This summary is machine-generated.

OpenSim Moco is a new software toolkit for musculoskeletal simulations. It uses direct collocation for faster, more versatile motion and control optimization in biomechanics research.

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Area of Science:

  • Biomechanics
  • Computational Biology
  • Robotics

Background:

  • Musculoskeletal simulations are crucial for applications like wearable robot design and analyzing impaired human movement.
  • Current simulation methods can be computationally intensive and require significant technical expertise.
  • There is a need for efficient and accessible tools for complex musculoskeletal modeling.

Purpose of the Study:

  • Introduce OpenSim Moco, a software toolkit for optimizing motion and control of OpenSim musculoskeletal models.
  • Provide researchers with a user-friendly tool that implements the direct collocation method for musculoskeletal simulations.
  • Enable advanced analyses including motion tracking, prediction, parameter optimization, and device design.

Main Methods:

  • OpenSim Moco utilizes the direct collocation method for musculoskeletal simulations.
  • The toolkit supports kinematic constraints, enabling the modeling of kinematic loops and complex anatomical movements.
  • Demonstrated capabilities through examples: optimizing walking motion, predicting effects of muscle weakness, and optimizing an assistive knee device.

Main Results:

  • OpenSim Moco successfully optimized muscle activity for observed walking, minimizing muscle excitations and knee loading.
  • Simulations predicted deviations in walking motion due to simulated muscle weakness.
  • Optimized stiffness for a knee assistive device during a squat-to-stand motion.

Conclusions:

  • OpenSim Moco offers a powerful, efficient, and accessible solution for musculoskeletal motion and control optimization.
  • The software accelerates research by simplifying complex simulation tasks for biomechanists.
  • Moco's capabilities in handling kinematic constraints and diverse problems advance the understanding of human and animal movement.