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LumbarSIM Disc Properties

I noticed in the LifeMOD Manual under plugins for LumbarSIM that there are stiffness and damping values for discs modeled as bushing joints with averaged DeJager data.  I haven't been able to find a reference for these values.  I saw there is a cervical spine paper...

De Jager MKJ, 1996, Mathematical Head-Neck Model for acceleration Impacts. PhD. Thesis: Eindhoven University of Technology, 1996.

...but haven't found a lumbar spine paper.  Does anyone have a reference for these values?


Thanks!


Greg