The paper describes a tele-rehabilitation system for simultaneous motor rehabilitation (post-stroke and post-arthroscopy) and continuous patient's condition assessment with the focus on patient safety observations. Micro-electro-mechanical accelerometer and gyroscope sensors attached to the patient gather information about the performed therapeutic exercises. The measurement data processing of the vital sign sensors and accelerometers is done in the health hub device in real time with the patient feedback. Model verification is used for providing that the specified requirements have been actually fulfilled. By the safety model validation, we supplement clinical evaluation, which means the efficacy of the system is proven by the rules given by the physician for the particular patient.