Joint moments in the spine

Hi Pavel,

Thank you for your message. Please see attached picture of the current trunk model that I am working on.

Starting from Sacrum joint, I issued similar commands to extract the moments in the MuscleMoment.txt file. MuscleElementList.any includes all the muscle elements in this model. Note that I do not have shoulder and arm body parts, so their muscles excluded. A flexion analysis of 36 degrees (motion performed by a combination of pelvis, lumbar and thoracic spines) yielded the results shown in the JointMoments.xlxs file.

I failed to understand what they actually mean. As I said before, I only need to extract moments provided by muscles. I understood from the reference manual that below code performs a free body analysis at the L4L5JntNode. So, it only includes segments below L4, and all the muscles that attaches to these segments, and gives and equivalent force and moment at the specified joint. To my understanding, this equivalent moment is the moment provided by the muscles. But, the results I produced did not make sense to me. Probably I misunderstood something.

  AnyForceMomentMeasure2 L4L5Jnt = {  
    AnyRefFrame &Ref = Main.HumanModel.BodyModel.Trunk.Segments.SegmentsLumbar.L4Seg.L4L5JntNode;
    AnySeg &Seg1     = Main.HumanModel.BodyModel.Trunk.Segments.SegmentsLumbar.L5Seg;
    AnySeg &Seg2     = Main.HumanModel.BodyModel.Trunk.Buckle.Segments.BuckleSeg;
    AnySeg &Seg3     = Main.HumanModel.BodyModel.Trunk.Segments.SegmentsLumbar.SacrumSeg;
    AnySeg &Seg4     = Main.HumanModel.BodyModel.Trunk.Segments.SegmentsLumbar.PelvisSeg;
    #include "MuscleElementList.any" };

Do you have any idea about this?

Regards,
Riza.