A lateral resection cutting guide for conducting knee surgery, the lateral resection cutting guide comprising: (a) a lateral resection cutting guide body; (b) a paddle connected to the lateral resection cutting guide body, the paddle including a substantially planar surface that is configured to be positioned on a substantially planar medial resection that has been formed on a tibia; and (c) a lateral resection cutting guide member connected to the lateral resection cutting guide body, the lateral resection cutting guide member having a substantially planar lateral resection cutting guide surface, the lateral resection cutting guide surface configured to guide a cutting or milling instrument to form a lateral resection in the tibia that is referenced from the medial resection wherein the lateral resection cutting guide surface is configured to guide the cutting or milling instrument such that the lateral resection in the tibia is co-planar with the medial resection in the tibia and further wherein the lateral resection cutting guide body includes a flag pin receiving opening the flag pin receiving opening configured to receive a flag pin inserted into a lateral resection navigation opening formed in the tibia, the lateral resection navigation opening oriented with respect to the tibia at a predetermined anterior/posterior slope, a desired internal/external rotation, and a desired medial/lateral position; wherein the flag pin receiving opening lies in a plane that is substantially parallel to the substantially planar surface of the paddle and is configured to interact with the flag pin such that the lateral resection cutting guide cannot rotate about a longitudinal axis of the flag pin when the flag pin is received in the opening. (a) a lateral resection cutting guide body; (b) a paddle connected to the lateral resection cutting guide body, the paddle including a substantially planar surface that is configured to be positioned on a substantially planar medial resection that has been formed on a tibia; and (c) a lateral resection cutting guide member connected to the lateral resection cutting guide body, the lateral resection cutting guide member having a substantially planar lateral resection cutting guide surface, the lateral resection cutting guide surface configured to guide a cutting or milling instrument to form a lateral resection in the tibia that is referenced from the medial resection wherein the lateral resection cutting guide surface is configured to guide the cutting or milling instrument such that the lateral resection in the tibia is co-planar with the medial resection in the tibia and further wherein the lateral resection cutting guide body includes a flag pin receiving opening the flag pin receiving opening configured to receive a flag pin inserted into a lateral resection navigation opening formed in the tibia, the lateral resection navigation opening oriented with respect to the tibia at a predetermined anterior/posterior slope, a desired internal/external rotation, and a desired medial/lateral position; wherein the flag pin receiving opening lies in a plane that is substantially parallel to the substantially planar surface of the paddle and is configured to interact with the flag pin such that the lateral resection cutting guide cannot rotate about a longitudinal axis of the flag pin when the flag pin is received in the opening.