Patent ID: 6123728
Filing Date: 2000-09-26
Classification: A61F

Abstract:
A knee prosthesis apparatus comprising:a) a tibial tray portion adapted to be surgically implanted on a patient's transversely cut proximal tibia;b) a femoral component;c) a fixator for holding the tray on the patient's proximal tibia;d) a tibial insert having a proximal surface that is shaped to engage a femoral component, the insert having a distal surface that fits against and articulates with the proximal surface of the tibial tray;e) a constraining mechanism that joins the tibial insert to the tibial tray portion during use in a selective fashion that enables a number of different possible relative motions between the tibial insert and tibial tray portion including anterior to posterior translation and rotation, rotation only, translation only, or no relative motion;f) wherein all or part of the constraining mechanism is separable from the tray and selective removal of all or part of the constraining mechanism determines which of the said possible relative motions will take place.