Patent ID: 7780671

Claim:
An apparatus for guiding a bone cut during knee joint replacement surgery in which a portion of the distal femur and a portion of the proximal tibia are removed and replaced with prosthetic components, 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 posterior slope rotation, and rotation about the anterior/posterior axis corresponding to varus/valgus rotation, the apparatus comprising: a spacer having a first surface engageable with the cut distal femoral bone, the first surface being substantially planar, a second surface opposite the first surface engageable with the uncut proximal tibial bone in joint articulating relationship, and a cut guide support, the cut guide support forming a predetermined posterior slope angle relative to the first surface, the posterior slope angle being greater than zero; and a tibial cut guide having a cutter guide defining a cut plane and a support engaging element engageable with the cut guide support, the cut guide support and support engaging element cooperating to position the cut plane at the predetermined posterior slope angle, wherein the cut guide support comprises an elongated member having a longitudinal axis and projecting outwardly from the spacer and wherein the longitudinal axis of the cut guide support forms the predetermined tibial posterior slope angle relative to the first surface.