The measuring and movement simulator system for the test and training of the shoulder joint Movement simulation according to nature’s example The shoulder joint is the most flexible ball joint of the human body. It can move on its axle in three different directions. It is primarily secured by muscles; therefore its mobility is hardly restricted by the skeletal structure. The computer-supported test and training system (CTT) IKARUS follows these parameters. It is a three-dimensional measuring and movement simulator for the test and training of the shoulder joint drives.