Orthopedic joint distraction device

An orthopedic distraction system comprising:

• a three dimensional position tracking system for tracking a position of a tibia and a femur of a knee joint;
• a robotic arm configured to apply forces to one of the tibia and femur, and measure the applied forces or displacements between the tibia and femur upon application of the forces to one of the tibia and femur;
• and
• a controller operatively in communication with the robotic arm, wherein the controller is configured to control the robotic arm to apply varying displacement forces between the tibia and femur based on a relative position between the tibia and the femur of the joint and determine a planned position of at least one of a femoral implant model and a tibial implant model based on the measured applied forces or displacements or the applied varying displacement forces between the tibia and femur.

A computer aided orthopedic surgery system comprising:

• an orthopedic distraction device that includes:
• a robotic arm configured to apply forces to one of the tibia and femur, and measure the applied forces or displacements between the tibia and femur upon application of the forces to one of the tibia and femur;
• and
• a computer operatively in communication with the robotic arm, wherein the computer includes:
• a display,
• a processor, and
• a non-transitory computer-readable medium having stored thereon at least one of a femoral knee implant model and a tibial knee implant model, and computer program instructions executable by the processor to cause the computer to control the robotic arm to measure forces or displacements between the tibia and femur upon application of the forces to one of the tibia and femur and determine a planned position of the at least one of the femoral implant model and the tibial implant model based on the measured forces or displacements or the applied forces between the tibia and femur.