Patent ID: 6494915
Filing Date: 2002-12-17
Classification: A61F

Abstract:
Knee prosthesis with mobile congruent insert capable of replacing a deteriorated knee articulation and allowing rotary movement with respect to one sole axis, comprising:a femoral component; a tibial component comprising a tibial insert and a tibial tray made of a metal and having a flat polished surface that bears a central pivot; and a patellar component; said knee prosthesis having a congruent one-piece plastic insert having a polished lower surface sliding, when in function, on the flat polished surface of the tibial tray in a way that a rotation axis of the plastic insert with respect to the tibial tray corresponds to an axis of the pivot, and having, at its lower surface, a cylindrical hole housing, when in function, the central pivot of the tibial component and allowing a free longitudinal movement of the pivot in said cylindrical hole; said plastic insert furthermore having condylar surfaces with radii that generate surfaces congruent to a condylar surface of the femur which, combined with the central pivot of the tibial tray, determines the relative movement between the femoral component and the tibial component; wherein the tibial component is made of an integrally cast one-piece element, the central pivot and the tibial tray being the same piece.