Human dynamics simulation requires external forces and moment. During gait analysis the full ground reaction forces and moments can be obtained using force plates. In some testing situations such as slope ascending/descending and stair walking full external ground reactions cannot be easily obtained while the joint kinematics can be obtained using camera systems. Recently mobile insole type pressure mat systems have been developed. The mobile pressure mat provides the pressure distribution and the center of pressure on the foot during walking though the shear forces (FX and FY) and the free moment along the vertical direction to ground (MZ) cannot be provided. The purpose of our study was to create a human musculoskeletal model and simulation to predict the shear forces and free moment from joint kinematics and pressure mat data. The predicted values were validated against the true values obtained from force plates.