Patent ID: 7744600

Claim:
An apparatus for guiding a bone cut during knee joint replacement surgery, the knee joint comprising a tibia and a femur and having a medial/lateral axis, an anterior/posterior axis, and a proximal/distal axis, rotation about the medial/lateral axis corresponding to extension plane rotation, and rotation about the anterior/posterior axis corresponding to varus/valgus rotation, the apparatus comprising: a first cut guide defining a first cut plane characterized by an angle relative to the knee joint; a second cut guide defining a second cut plane characterized by an angle relative to the knee joint, the second cut guide being mounted to the first cut guide; and a relative angle adjustment mechanism operably connected between the first and second cut guides to adjust the relative angle between the cut planes of the first and second cut guides; wherein the first cut guide comprises a tibial cut guide and the second cut guide comprises a femoral cut guide, the femoral cut guide being pivotably mounted to the tibial cut guide, the angle adjustment mechanism being operable to pivot the femoral cut guide relative to the tibial cut guide to adjust the relative extension plane angle between the two cut planes.