Leg length discrepancy causes a shift in the human body center of mass and results in asymmetry in weight distribution on both legs. Existing methods used to assess leg length discrepancy do not take into account this shift in the center of mass. In this dissertation, a new methodology is described, along with a mechatronic system for the evaluation and compensation of the difference in leg length. This is done by balancing the human body. The developed mechatronic system consists of two parallel manipulators with moving platforms that are used to measure the distributed weight. The evaluation and compensation of the difference in leg length is done by positioning the patient into marked positions on the load distribution measuring platforms, which measure the center of pressure of each leg. Based on this, the human body center of mass in the transverse plane is evaluated. The state of the human body is then evaluated with the help of visual feedback, showing if the human body has leg length discrepancy and/or scoliosis. With the projection of the center of mass of the human body and the state of the body, the developed human body balancing algorithm is used, which gradually raises the height of the moving platform under the shorter leg. As a result, the leg length discrepancy is compensated, and the height difference between the two platforms represents the assessed difference in leg length. The scientific contributions of this doctoral dissertation are as follows: 1. A mechatronic system with two 3-RPS parallel manipulators and moving platforms used to measure weight distribution when evaluating leg length discrepancy 2. The process of assessing the location of the human body center of mass projection in the transverse plane by using moving platformsand visual feedback 3. The process of balancing the human body with the goal of compensating leg length discrepancy