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Constrained Lumbar Spine Model
This project holds three different OpenSim-based musculoskeletal model of the human lumbar spine. Please refer to the ReadMeFirst document for more detail on the documents/model downloads available. Briefly, the models differ in their complexity with the simplest (Lumbar_C_4) featuring only 4 muscle fascicles, and no wrapping surfaces, while the more complex ones have 210 (Lumbar_C_210) and 238 (Lumbar_C_238) muscle fascicles respectively as well as wrapping surfaces for the erector spinae muscle fibers. The joints in all three models are modeled as ball and socket joints with three rotational degrees-of-freedom constrained to be a fraction of the net lumbar motion. In order to respect the time and effort put in by the original developers please carefully read accompanying publications and cite appropriate references in future work. Good luck and Have Fun!
Release 1.0
Nov 09, 2010

Download Links

Nov 12, 2010
78 KB
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Other
Constrained Lumbar Spine with 4 muscle fascicles

Nov 12, 2010
686 KB
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Other
Constrained Lumbar Spine with 210 muscle fascicles

Nov 12, 2010
743 KB
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Other
Constrained Lumbar Spine with 238 muscle fascicles

Nov 12, 2010
38 KB
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Source code
Contains code to generate the motion files, as well as some example motion files for flexion-extension, lateral bending and axial rotation

Documentation Links

Nov 12, 2010
Document explainng the lumbar spine models and other attached files

Nov 12, 2010
Briefly describes what the moment arm of a muscle signifies.

Nov 12, 2010
Brief explanation of joints and coordinates in OpenSim

Nov 12, 2010
Some notes on the StaticOptimization function in OpenSim - what the objective function means & how to decipher the Stat.Opt output messages

PLEASE CITE THESE PAPERS

M. Christophy. A detailed open-source musculoskeletal model of the human lumbar spine. Master’s thesis, University of California at Berkeley, 2010. (2010)

M. Christophy, N. A. Faruk Senan, O.M. O’Reilly, and J. C. Lotz. A musculoskeletal model for the lumbar spine. Submitted for publication. (2010)


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Editing .vtp Geometry Files
Briefly explains how to edit the .vtp files available in the OpenSim "Geometry" folder if you don't have a .vtp file editor. Useful in, e.g., redefining the origin of the .vtp file to coincide with the center of mass of the body. - The pdf explains how to do things on your own. - matlabCode is the Matlab Code alone, assuming you've copied and pasted the appropriate portion of the .vtp file into corresponding .txt files - Tryout Example contains the Matlab Code, input and output .txt files, and a folder containing the lumbar .vtp files with origins set to the geometric centers of the bodies. The easiest way to do things is to read through the .pdf explanation first and really understand it. That'll help you decide if you need to download the Matlab Code/Tryout Example folder.
v1.0
Sep 12, 2011

Download Links

Sep 13, 2011
1 KB
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Source code
Matlab Code

Sep 13, 2011
66 KB
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Source code
File to test things out. Contains the Matlab Code too.

Documentation Links

Sep 13, 2011
Explains how to edit .vtp files if you don't have a .vtp file editor


lumbarspine
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New Spine .vtp Geometry Files
A set of .vtp Geometry files to be used to model the spine. These are modified versions of those available in OpenSim's Geometry folder, but the origins have been moved to the center of the vertebras. Two sets are featured. One consists of the Sacrum through Lumbar 1 while the second consists of the Lumbar 5 through Thoracic 1 .vtp giles.
v1.0
Sep 13, 2011

vertebral .vtp Geometry files with origins located at the vertebral centers of geometry.

Download Links

Sep 13, 2011
44 KB
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Data/images/video
.vtp files for the Sacrum through Lumbar 1

Sep 13, 2011
113 KB
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Data/images/video
Lumbar 5 through Thoracic 1 .vtp files with origins at vertebral centers

Documentation Links

Sep 13, 2011
Contains details with regards to the .vtp geometry files


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