Femoral element of knee spacer

A spacer device comprising:

• a femoral element designed to be constrained to a femoral bone and having a “C” plan configuration, wherein each free end of the “C” delimits a condylar portion or posterior lobe of said femoral element, said femoral element having a first articulation surface facing, in use, towards a tibial element for articulating said femoral element on or with the tibial element, and a second surface opposite to the first articulation surface for attachment to a femoral bone, said first articulation surface having, at a rear or at each posterior lobes or condylar portion, a terminal section opening or extending up to a free or terminal edge of said posterior lobe or condylar portions said terminal section being straight by having parallel inner and outer walls and extending so as to be, in use, parallel to a craniocaudal axis or inclined with respect to the craniocaudal axis, or said terminal section being curved with a radius of curvature at least 50% larger than a radius of curvature of an adjacent and subsequent section of the first surface, and
• the tibial element configured to be constrained to a tibial bone, at one end of the tibial bone facing a knee joint, the tibial element comprising a first surface facing, in use, towards the femoral element and designed to articulate or engage with said first articulation surface of said femoral element and a second surface opposite to the first articulation surface and for constraint to the tibial bone.