A tibia cutting jig mechanism (TCJM) is provided having a number N1 of spaced apart TCJM contact points that correspond to a number N1 of spaced apart knee contact points on at least one of a tibia plateau surface and a tibia shaft surface. The TCJM contact points are positioned in contact with the tibia contact points, and a cut bar guide is positioned in contact with the TCJM to provide a location and an angular orientation of a cut bar plane that is to be used to resection and remove a selected portion of the patient's tibia. The TCJM is removed from the patient's knee, and a selected portion of the patent's tibia is resectioned and removed. The number N1 is at most about seven in some embodiments.