Patent ID: 8241367
Filing Date: 2012-08-14
Classification: A61F

Abstract:
1. A tibial component of a knee prosthesis, comprising: a tibial tray having substantially planar top and bottom surfaces and an axis extending between said surfaces, at least one fin extending radially outwardly along the bottom surface and projecting axially downwardly, the tray further 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, a bottom end, an outer surface, and an axis from the top end to the bottom end generally parallel to the tray axis, at least one fin extending axially along the outer surface and projecting radially outwardly, the tray and keel fins being generally axially aligned with one another from top to bottom to project as a single fin, the tibial keel further 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 tibial tray with the boss received in the first axial bore of the tibial keel, the tapered portion of the boss seating on the tapered portion of the first axial 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, wherein at least one of the first and second junctions includes a rotational alignment means for aligning the tibial tray and the tibial keel in a predetermined relationship for assembly, the alignment means being formed within the junction.