An orthopaedic surgical instrument system (70) for use in preparing a patient's bone includes a cutting guide block (72) configured to be secured to a surgically-prepared surface of the patient's bone, and a cutting tool (74) to be used in conjunction with the cutting guide block to resect a section of the patient's bone. The cutting block has a cutting guide slot (76) extending through its superior and inferior surfaces. The slot is shaped so that the pitch of the cutting tool is adjusted as the tool is moved along the slot.
