My current project is about dynamic load during walking in children with angular deformities.
We use the Lower Extremity MoCap model provided in the AMMR v2.2.0 and we utilize the TLEM 2.0 version. Additionally we use the AnyKnee Model as AddOn.
When using the 3E-Hill Modell, many muscles are overloaded, but that’s not that “big” problem.
My focus is on the KneeContactForces. We have the problem, that the forces at the knee are really high and inexplicable peaks appear, especially during the stance phase.
Not with all persons/Models this problem occurs however with most. Have you perhaps had these problems before and know how to deal with them? Probably it is also because of the high muscle activity?
If the simple knee model is used, there are no peaks.
Below are two examples of how the knee contact force looks like, not really physiological.
Concerning the AnyKnee model are you using with the fixed or moving axis?
Do you see the same problem if you are using constant strength muscles?
Concerning the hill muscle models, please ensure to run the calibration study before running inverse analysis otherwise strengths will be wrong which may lead to overactivations, which again in principle could lead to some fluctuations.
If the model does not run with the default kinlimit, this needs to be fixed to be able to move forward.
Please let me know if the model fails in the first frame or if it happens on the way in the analysis?
If it fails in the first frame the initial positioning of the model needs to be improved, if it happens on the way it can relate to the maker configuration.
Pease describe your maker configuration a bit.
Are the model able to finish the parameter optimization?