Total knee joint comprising an insert movable relative to a tenon

A total knee prosthesis comprising a tibial insert between a tibial plate provided on its inner surface with means for anchoring to a proximal end of a tibia, the tibial insert being slidably mounted on the tibial plate and comprising

• a tenon being mounted so as to project from the outer surface of the tibial plate and comprising a base and an oblong part extending from the base parallel to the outer surface of the tibial plate;
• and
• the tibial insert comprising a cavity in which the oblong part engages with possibility at least of rotation of the oblong part relative to the tibial insert, wherein the size and shape of the cavity are such that the base of the tenon in the cavity can move relative to the tibial insert in antero-posterior and/or medio-lateral translation in said cavity, wherein the hole is in the shape of an isosceles triangle having corners complementary in shape with the lateral wall of the base of the tenon.