Instrumentation for and a method of sizing the end of a distal femur, and resecting the distal femur. An instrument body construct is provided with an instrument body and a valgus module for attachment to the instrument body. The instrument body construct has a distal aspect abutting surface with a planar face for abutting the distal aspect of a distal femur at a fixed angle to the longitudinal axis of the distal femur, having a posterior aspect abutting surface with a planar face for abutting the posterior aspect of the distal femur, and having a passageway therethrough. An anterior feeler gauge is provided for attachment to the instrument body construct and for contacting a portion of the anterior aspect of the distal femur to indicate the anterior-to- posterior size of the distal femur. A resection guide is provided for attachment to the instrument body construct for guiding a bone resection tool to resect the distal femur. The resection guide may have a first position for guiding the bone resection tool to perform an anterior femoral resection and a second position for guiding the bone resection tool to perform a distal femoral resection.
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