A method for robotic knee surgery on a femur and tibia of a knee joint. A navigation system tracks positions of the femur and tibia during the surgery as the femur and tibia move during the surgery. Information relating to the tracked positions of the femur and tibia is communicated from the navigation system to the robotic system. This information is used to guide movement of a cutting tool of the robotic system relative to the femur and tibia so that material from the femur and tibia can be removed by the cutting tool without the use of physical resection guides.
