A modular knee prosthesis system comprises a distal femoral articulation component (10), a distal augment (60), a posterior augment (62) and a first connector (78) for securing at least one of the augments to the distal femoral articulation component through a bore (74) in the augment and an opening (57, 58, 59) in the distal femoral articulation component. The distal femoral articulation component has a distal bone-facing surface (26, 28), a posterior bone-facing surface (30, 32) and an opening. The openings into the bores of the augments are in the medial or lateral side surface of the augment. Both augments can be mounted and removed from the distal femoral articulation component from either the medial or lateral side.
