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  #1  
Old 05-09-2017, 05:25 PM
tjwjdal tjwjdal is offline
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Default observing the sagittal knee joint torque

Good morning. I am currently observing the knee with the following model.
(Since we created the motion separately, please
do not proceed with "MotionAndParameterOptimizationModel".)

In order to observe the sagittal knee joint torque I am looking following path.

Main.Studies.InverseDynamicStudy.Output.BodyModel. *(Left or Right). Leg.Jnt.Knee.Constraints.Reaction.RefFrameOutput.M [0] [2]

But the patterns and values are strange.

I doubt the following, but I do not know the exact answer.
- Is there a problem with the Joint drivers?
- Is the moment in the y direction (M [0] [1]) is sagittal torque??
- Is the above path inadequate to observe Joint Torque?

I will be waiting for your reply.
Always Thank you.
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File Type: zip JWCF.zip (2.62 MB, 1 views)
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  #2  
Old 05-10-2017, 09:01 AM
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toerholm toerholm is offline
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Default

Hi

I have been unable to run the model i think you have modified the forceplate class and provided it.

The property you are looking at is the moment in the reference frame , measured in global. I think you will also see that the two moments have the same values but differences in signs.

Best regards
Søren
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  #3  
Old 05-10-2017, 09:25 AM
tjwjdal tjwjdal is offline
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Default modified file

I'm really sorry.
So I attached other file using real data.

You mean that the sagittal moment will be M [0] [0] (on the x-axis moment), because it use grobal coordinate.
But I think this result is too small.
Therefore, I think there is a problem with my model.


And the following path is different from the joint torque?
Main.Studies.InverseDynamicStudy.Output.BodyModel. Right.Leg.MomentMeasure.KneeNetMomentMuscle.M (or Mlocal)

Sorry to trouble you.
Thank you.
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File Type: zip 0510 debug.zip (23.77 MB, 1 views)
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  #4  
Old 05-15-2017, 11:24 AM
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toerholm toerholm is offline
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Hi

I have tested the model and it gives a max moment of 37Nm in the knee running with no muscles..

The moment has six components.

Ref frame 1 : Mx,My Mz global
Ref frame 2 : Mx,My Mz global


Please have a look in the book "Dynamics of Human Gait" by Christopher L Vaughan, for a good references on actual values.


Best regards
Søren
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  #5  
Old 05-15-2017, 12:30 PM
tjwjdal tjwjdal is offline
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Default Where can I get the value?

Thank you for your reply.
I'm sorry, but I would like to ask you once more that it confused.

Where can I get the value of 37Nm?
The reaction moment (Main.Studies.InverseDynamicStudy.Output.BodyModel .Right.Leg.Jnt.Knee.Constraints.Reaction.RefFrameO utput.M) of the knee shows that the maximum value in the sagittal direction is -2.66Nm and the maximum value in the coronal direction is 15.8Nm.

Where can I get the value of 37Nm and what is the direction?
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  #6  
Old 05-15-2017, 12:36 PM
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toerholm toerholm is offline
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The 37Nm applies to the left leg, you are correct about the right knee it was about 15 Nm
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