A modular knee prosthesis system includes a femoral component (10) having a stem (16) and a sleeve (24, 26). The system is modular, and provides the surgeon with the option of distally offsetting the joint line by controlling the relative axial positions of the stem and the sleeve. The system can make use of sleeves with tapered bores of different diameters, providing a shim to be placed between the sleeve and the stem and providing the stems as adapters having different diameters.
