An innovative motor-driven knee holding device specially to meet the requirements of modern, “dynamic” knee surgery. Maquet has developed an innovative motor-driven knee holding device specially to meet the requirements of modern, “dynamic” knee surgery. Using a foot switch, the extension device allows the surgeon unassisted control over intraoperative flexing and stretching movements, which are essential for successful knee surgery. The knee device from Maquet is ideal for a wide range of surgical interventions, from arthroscopy through kneecap and open tendon surgery, through to bone resectioning or prosthetics.