In this monograph, two novel mechanical models are presented: an analytical-kinetical model with regard to the kinetics of the human knee joint under non-standard squatting, and a numerical-kinematical model with regard to the local kinematics (sliding-rolling phenomenon) of the knee joint under standard squatting. The new analytical-kinetical model is capable to calculate the patellofemoral, tibiofemoral, patellar tendon and quadriceps tendon forces in the knee joint under different squatting motions. The model takes the effect of a moderate trunk motion (horizontal shift of the center of...