Fig. 5

Comparison of the experimental and calculated knee contact forces applied on the tibia plateau during normal walking: a forces. b Moments. c Reference system used to define the experimental forces retrieved from the database OrthoLoad [18]. d Reference system used to define the calculated knee joint forces by means of the musculoskeletal model “GaitFullBody” from the model repository in the software AnyBody. The indices “calc” and “exp” in the legends refer to the calculated and the experimental quantities respectively. The knee joint is modelled as a hinge joint anchored at the middle of the femoral transepicondylar axis. The X axis is the axis of the hinge joint hence the component Mx is equal to zero