An orthopaedic surgical instrument includes an anterior/posterior femoral cutting block (12) having anterior (24) and posterior (30) cutting surfaces. A chamfer access window (36) is positioned between the anterior cutting surface and the posterior cutting surface. The A/P femoral cutting block includes an interference-fit connector (56, 58). A chamfer femoral cutting block (14) has a wedge-shaped chamfer cutting surface (82) positioned in the chamfer access cutting window. An interference-fit connector (114) is connected to the interference-connector of the A/P femoral cutting block so as to removably secure the chamfer femoral cutting block to the A/P femoral cutting block.
