Patent ID: 7857858
Filing Date: 2010-12-28
Classification: A61F

Abstract:
1. A tibial component of a knee prosthesis, comprising: a tibial tray having substantially planar top and bottom surfaces, the tray including an outwardly projecting boss extending from the bottom surface, the boss having an outer wall including a cylindrical portion and a tapered portion and an inner wall defining a throughbore; a tibial keel forming an elongate body having a top end and a bottom end, the tibial keel including a first axial bore extending inwardly from said top end and forming a bore wall, the bore wall including a cylindrical portion and a tapered portion, the tibial keel being removably engageable with the tray with the boss received in the first bore of the tibial keel, the tapered portion of the boss seating on the tapered portion of the first bore to define a first junction between the tibial tray and the tibial keel, and the cylindrical portion of the boss being received by the cylindrical portion of the first bore in press-fit relationship to form a second junction between the tibial tray and tibial keel, the outer wall of the boss and the bore wall of the tibial keel cooperating to define a circumferential gap between the first junction and the second junction when the tibial component is finally assembled, the tibial keel including a second axial bore extending inwardly from said bottom end; a stem extension removably affixed to the second axial bore; and wherein the tibial tray and tibial keel are spaced from one another everywhere except at the cylindrical and taper seating portions of the first and second junctions.