I DOWNLOADED OPENSIM - NOW WHAT?
This introductory tutorial at the 2015 Gait and Clinical Movement Analysis Society (GCMAS) annual meeting provides hands-on lessons meeting will provide practical tips for getting started with OpenSim.
The workshop will take place on Wednesday March 18, 4-6pm. The workshop will feature a practical, hands-on tutorial will introduce participants Participants will be introduced to OpenSim’s features, file formats, and documentation using HANDS-ON, clinically-relevant examples.
Full Abstract: OpenSimTutorial gcmas2015.pdf
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Learning Objectives
OpenSim is open-source software that allows users to analyze and visualize models of the musculoskeletal system and to generate dynamic simulations of walking and other movements (see Delp 2007).
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OpenSim is highly relevant to the GCMAS Community because it enables users to study the effects of musculoskeletal geometry, joint kinematics, and muscle-tendon properties on the forces and joint moments that muscles can produce.
By this end of this tutorial, participants will be able to:
- Identify components of an OpenSim model (GUI & XML)
- Load a model and animate it
- Use OpenSim's Plot Tool to plot muscle moment arms and other data
- Use OpenSim's Scale and Inverse Kinematics Tools to scale a model and solve for the model's joint angles from marker data
- Analyze a model to explain how force-generating capacity changes after a simulated surgery
- List the steps needed to process experimental data for input into OpenSim
- Locate OpenSim documentation, examples, and resources
Preparing for the Tutorial
Enrolled participants Participants should bring a Laptop running (or be prepared to share with a colleague) a laptop running the Windows operating system with OpenSim and OpenSim installed.
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Notepad++ installed. Bring a computer mouse, too.
Before the tutorial:
(1) Please test your installations by completing the quick exercises posted below.
(2) Download the GCMAS tutorial files (coming soon).
Download OpenSim
OpenSim is hosted on SimTK, a cloud storage service for biomedical tools and research. Download OpenSim 3.2. There There are 32- and 64- bit versions available and are designed to correspond with your system requirements. If you are unsure how to find this out; which version you need, click here.
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Download OpenSim 3.2. |
Download Notepad++
OpenSim model files and setup files are written in xml. Notepad++ is a free text editor that makes it easier to view and edit xml files. During the tutorial we will use Notepad++ to examine OpenSim files.
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Download Notepad++ |
Download the Pre-Tutorial Test Exercises
Please download and complete the following exercises PRIOR to the tutorial. We've compiled these exercises to:
- Confirm that you've installed OpenSim correctly
- Introduce you to some useful features of OpenSim's GUI
- Help you configure Notepad++ to recognize OSIMM files as XML files
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Download Pre-Tutoral Test Exercises |
Download the GCMAS Tutorial Files
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Download Tutorial Files. |
Download Guided Tutorial Exercise (pdf)
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Download Guided Tutorial |
Download Tutorial Slides (pdf)
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Download tutorial slides |
Workshop Staff and Contact Information
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) Concord Field Station, Harvard University
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Neuromuscular Biomechanics Laboratory, Stanford University
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au) School of Allied Health Sciences, Griffith University
| Ability & Innovation Lab, University of Washington  |
Neuromuscular Biomechanics Laboratory, Stanford University
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Tutorial Exercises and Demos
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Intended Audience: The tutorial is designed for GCMAS attendees (scientists, clinicians, and students) who are curious about the capabilities of OpenSim, but who have not previously used the software.
Prerequisite Knowledge:
Participants will be asked to bring (or share with a colleague) a laptop PC with a mouse and with OpenSim and Notepad++ installed. Instructions for installing and getting started with these programs (both freely available) will be emailed to participants prior to the tutorial. To complete the hands-on exercises, participants must be comfortable navigating to files and managing multiple windows on their laptops. Participants will work in small teams at their own pace (guided by instructors), so exercises will be accessible to participants with varying backgrounds.
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Learning Objectives:
1. Identify components of a musculoskeletal model in OpenSim and in the model’s XML file.
2. Load a model in OpenSim and animate it using measured joint angles and/or marker trajectories.
3. Use an OpenSim model to examine whether muscle force- or moment-generating capacity
changes substantially following a simulated surgery.
4. Describe the steps needed to process motion capture and GRF data for input into OpenSim.
5. List three limitations of existing OpenSim tools and three features to watch for in upcoming
releases.
6. Locate OpenSim online resources, documentation and examples for further exploration.
Content: Minutes
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− What is OpenSim and what can the software do?
− What will this tutorial cover?
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Useful Links and Literature
National Center for Simulation Research (NCSRR)
OpenSim Documentation (Confluence)
Overview of the OpenSim Workflow
OpenSim: Open-Source Software to Create and Analyze Dynamic Simulations of Movement
Scott L. Delp, Frank C. Anderson, Allison S. Arnold, Peter Loan, Ayman Habib, Chand T. John, Eran Guendelman, and Darryl G. Thelen
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING, VOL. 54, NO. 11, NOVEMBER 2007
Is My Model Good Enough? Best Practices for Verification and Validation of Musculoskeletal Models and Simulations of Movement
Jennifer L. Hicks, Thomas K. Uchida, Ajay Seth, Scott L. Delp.
Journal of Biomechanical Engineering, Volume 137, Issue 2, 2015
Muscle contributions to vertical and fore-aft accelerations are altered in subjects with crouch gait
KM Steele, A Seth, JL Hicks, MH Schwartz, SL Delp
Gait & posture 38 (1), 86-91
Can biomechanical variables predict improvement in crouch gait?
JL Hicks, SL Delp, MH Schwartz
Gait & posture 34 (2), 197-201
Crouched postures reduce the capacity of muscles to extend the hip and knee during the single-limb stance phase of gait
JL Hicks, MH Schwartz, AS Arnold, SL Delp
Journal of biomechanics 41 (5), 960-967