A method of preparing a femur for receipt of a prosthesis, includes selecting an assessment device from a plurality of devices, each of the devices include first and second contact surfaces positioned at different elevations from a bottom surface of the device； inserting the device into a knee joint such that the bottom surface of the device contacts a resected surface of a tibia, the first contact surface contacts a first condylar surface, and the second contact surface contacts a second condylar surface, the first and second contact surfaces have a fixed relationship relative to the bottom surface while disposed within the joint； determining a condylar angle of a condylar axis defined by the first and second condylar surfaces based on a known offset distance between the first and second contact surfaces； and resecting the first and second condylar surfaces along a plane based on the condylar angle.
