This single axis modular knee joint with a hydraulic cylinder ensures smooth and safe walking. It works in different modes: swing phase control adjustment and stance control, walking, cycling and workout at the gym. The maximum (according to Technical Means) flexion angle is 125°, which facilitates movement on uneven terrain, stairs, while kneeling and making other functional movements with prosthesis. Thanks to the design of ultra-light and tough materials this knee joint is considered to be the lightest in the world in its class mobility.