A reamer (8) for reaming a portion of a long bone cavity for use in implanting a joint prosthesis. The reamer is used in cooperation with a portion of an orthopaedic implant component and includes an expandable body that is adapted to adjust between a plurality of diameters. A plurality of cutting edges (310) are also included and extend outwardly from the body, the edges adapted for cooperation with bone, and the cutting edges expanding as the expandable body expands.