A keel punch (22) for use in preparing the proximal end of a patient's tibia during a surgical procedure to implant an orthopaedic knee prosthesis, includes a base plate (78) and a central post (94) extending upwardly from a superior surface (96) of the base plate. A superior surface of the central post has a ramp surface (102) defined therein which inclines superiorly in the anterior-to-posterior direction. A pair of serrated wings (140) extends inferiorly from an inferior surface of the base plate.
