OpenSim is a freely available, user-extensible software system for developing musculoskeletal models and for simulating and analyzing movement. By creating dynamic simulations of movement that combine anatomical models with the physics of the musculoskeletal system, researchers can investigate elements of biomechanics that are difficult to study through experimentation alone.


This tutorial will take you through a typical workflow using OpenSim. You will use several of the OpenSim Tools to estimate the muscle forces of a human leg model during stance and swing phases of gait. In Part I: Leg Muscle Force Estimation in Swing, you will

In Part II: Leg Muscle Force Estimation in Stance, you will

If you are completing this example as a laboratory exercise for a course on human movement, you will need to submit answers to the questions on the Questions: Leg Muscle Force Estimation page.


This example was created by Ajay Seth, Samuel Hamner, Kat Steele, Jennifer Hicks, Matt DeMers, Thomas Uchida, Daniel Jacobs, and Scott Delp. It was developed for teaching a workshop at the International Society of Biomechanics and refined for Prof. Delp's class at Stanford University.


Getting Started

The files required for this example can be found in the Models directory of your OpenSim Resources Folder (e.g., Documents\OpenSim\4.0\Models\Leg6Dof9Musc).

A copy of these instructions can be saved as a .pdf or a Word document by selecting "Export to PDF" or "Export to Word" from the Tools menu in the top-right corner of this page.


Next: Part I: Leg Muscle Force Estimation in Swing

Home: Examples and Tutorials