I just run inverse dynamics analysis using GiatLowerExtremity model (AMMRV1.31, AnyBody version 5) using C3D data. When I checked on the Selected Ouput, we have : Knee lateral moment.

My questions are:

What is the meaning of knee lateral moment? is it knee varus-valgus moment? if yes, can anybody tell me when it is positive, which direction of this moment pointing out to? and vice versa when its negative.

When I check the model, this direction was relative to the thigh coordinate system.

And Knee_LateralMoment value came from the first component of Mlocal value of above measure,
the sign of Knee_LateralMoment follows the coordinate system of Thigh.KneeJoint reference nodes.

Attached please find a snapshot of the KneeJoint coordinate system.
Then according to the right-hand-rule around the X-axis, you can find which direction will have the positive sign.

Thanks for sharing about knee lateral moment, since in the model, the knee joint is a point contact between femur and tibia, so knee varus-valgus direction is in vertical direction (y axis), is it correct?

And since this is a moment, moment is (force x moment arm)some distance which is perpendicular to the center of rotation. Can we know from the model how much is that distance defined in the model?

Please clarify me if I am wrong.
I still don’t understand with the moment direction. So, when it is positive, the moment is directing to the z axis and when it is negative the moment is pointing out to minus z axis. if this is the case then its the same as knee medial and lateral side? (correctme if I am wrong)

I guessed that the varus-valgus moment is pointing out at y-azis (positive or negative respectively) but the question is then, at which side? lateral or medial?
(I thought like this based on its name: knee lateral moment)

I understand now the axis and the direction of knee varus valgus moment, thanks for the example code. However, further question will be, can knee lateral moment from Anybody say which moment is that, whether it is a knee varus moment or knee valgus moment? or maybe AnyBody takes an assumption that all knee lateral output is knee varus moment??

the difference between varus moment and valgus moment is only the direction. From the example, one force will lead to the varus moment, when switching the sign, it will lead to the valgus moment. AMS shows that in plus or minus moment.