How to assign mMPTA to our model?

[Sina Tabeiy]

Dear all readers,

mMPTA is the abbreviation form of Mechanical Medial Proximal Tibia Angle which highly affects Varus or Valgus of the knee (depends on its magnitude it could lead to Varus or Valgus).
Here my question is, do you know how I can assign this parameter to opensim in order to give the best approximation of the model? If you know, I would really appropriate your kindness to share your knowledge with me.

Sincerely