A femoral orthopaedic surgical instrument (10) includes a posterior femoral trial (14) having a cutting guide (28) defined therein and an anterior femoral trial (16) removably coupled to the posterior femoral trial. The anterior femoral trial may also include a cutting guide (42) defined therein. The femoral orthopaedic surgical instrument may also include a base block (82) couplable to the posterior femoral trial in place of the anterior femoral trial. A plurality of additional orthopaedic instruments (88,96) may be coupled to the base block.