Patent ID: 6660039
Filing Date: 2003-12-09
Classification: A61F

Abstract:
A knee prosthesis for replacing all or part of a patient's knee joint comprising:a) a tibial component adapted to be surgically implanted on a patient's transversely cut proximal tibia; b) a fixator for holding the tibial component on the patient's proximal tibia; c) a tibial insert having a distal surface that fits against and articulates with the proximal surface of the tibial component and a proximal articulating surface that has a central projecting portion and a posterior projecting portion; d) a femoral component that articulates with the tibial prosthesis at the proximal articulating, surface of the tibial insert, the tibial insert having condylar surfaces that engage but do not substantially constrain the condylar surfaces of the femoral component; e) a constraining mechanism that enables a connection to be made between the insert and the tibial component during use; and f) an anti-rotation bar for resisting relative rotation between the femoral component and the tibial insert, including a cam on the femoral component and recess on the tibial component that is posterior to the central projecting portion; g) wherein the anti-rotation bar engages said projecting portions to prevent rotational dislocation of the tibial insert during flexion.