A modular knee prosthesis system comprising: a distal femoral component having a pair of spaced, curved distal condylar surfaces (12, 14) and a stem having an outer surface tapering from a distal end in the proximal direction, the outer surface of the stem having a maximum outer diameter at the distal end and a smaller outer diameter at a second position proximal to the distal end, characterised in that the system includes: a first metaphyseal member having an outer surface that tapers in a proximal direction and an inner surface defining a tapered bore (68, 72) sized and shaped to be mountable on the stem of the distal femoral component and to create a frictional lock between the stem of the distal femoral component and the first metaphyseal member, the tapered bore having a maximum inner diameter at a distal end, the maximum inner diameter corresponding with the maximum outer diameter of the stem of the distal femoral component, and a second metaphyseal member having an outer surface that tapers in a proximal direction and an inner surface defining a tapered bore (70, 74) sized and shaped to be mountable on the stem of the distal femoral component and to create a frictional lock between the stem of the distal femoral component and the second metaphyseal member, the tapered bore having a maximum inner diameter at a distal end, the maximum inner diameter corresponding with the outer diameter of the stem of the distal femoral component at the second position so that the first metaphyseal member and the second metaphyseal member are mountable on the stem of the distal femoral component to create frictional locks at different positions in the proximal-distal direction on the stem of the distal femoral component. a distal femoral component having a pair of spaced, curved distal condylar surfaces (12, 14) and a stem having an outer surface tapering from a distal end in the proximal direction, the outer surface of the stem having a maximum outer diameter at the distal end and a smaller outer diameter at a second position proximal to the distal end, characterised in that the system includes: a first metaphyseal member having an outer surface that tapers in a proximal direction and an inner surface defining a tapered bore (68, 72) sized and shaped to be mountable on the stem of the distal femoral component and to create a frictional lock between the stem of the distal femoral component and the first metaphyseal member, the tapered bore having a maximum inner diameter at a distal end, the maximum inner diameter corresponding with the maximum outer diameter of the stem of the distal femoral component, and a second metaphyseal member having an outer surface that tapers in a proximal direction and an inner surface defining a tapered bore (70, 74) sized and shaped to be mountable on the stem of the distal femoral component and to create a frictional lock between the stem of the distal femoral component and the second metaphyseal member, the tapered bore having a maximum inner diameter at a distal end, the maximum inner diameter corresponding with the outer diameter of the stem of the distal femoral component at the second position so that the first metaphyseal member and the second metaphyseal member are mountable on the stem of the distal femoral component to create frictional locks at different positions in the proximal-distal direction on the stem of the distal femoral component. a first metaphyseal member having an outer surface that tapers in a proximal direction and an inner surface defining a tapered bore (68, 72) sized and shaped to be mountable on the stem of the distal femoral component and to create a frictional lock between the stem of the distal femoral component and the first metaphyseal member, the tapered bore having a maximum inner diameter at a distal end, the maximum inner diameter corresponding with the maximum outer diameter of the stem of the distal femoral component, and a second metaphyseal member having an outer surface that tapers in a proximal direction and an inner surface defining a tapered bore (70, 74) sized and shaped to be mountable on the stem of the distal femoral component and to create a frictional lock between the stem of the distal femoral component and the second metaphyseal member, the tapered bore having a maximum inner diameter at a distal end, the maximum inner diameter corresponding with the outer diameter of the stem of the distal femoral component at the second position so that the first metaphyseal member and the second metaphyseal member are mountable on the stem of the distal femoral component to create frictional locks at different positions in the proximal-distal direction on the stem of the distal femoral component.