Total knee and hip implants are usually designed for the static load of standing man, but the static load is not extreme. The top of research is to search extreme values forces and moments at leg and arm joints. The implants can be then designed for these extreme dynamics loads. Human fall was observed by camera system to record the position data of main points on human body. The 3D coordinates of the end of foot, ankle, knee, hip, pelvis, shoulder and wrist were stored. The simulation program of human fall was compiled at PC in language C++ using simulation system CDCSIS. The program has an input data - length, mass and inertia moments for each part of human body. The data are transformed according to actual coordinates of points on the body. Then the moving and turning accelerations are calculated and joint forces and moments are determined according to the d’Alembert’s principle. At the conclusion the noise is canceled.