A cutting tool of a robotic system cuts away material from the femur without the use of physical resection guides while a navigation system tracks movement of the femur, with the navigation system cooperating with the robotic system to provide information associated with the position of the femur to the robotic system. The cutting tool of the robotic system also cuts away material from the tibia without the use of physical resection guides while the navigation system tracks movement of the tibia, with the navigation system cooperating with the robotic system to provide information associated with the position of the tibia to the robotic system. The navigation system enables separate tracking of the femur and tibia so that their respective positions can be determined when the femur and tibia move during surgery, with movement of the cutting tool relative to the femur and tibia represented on a display.
