Patent ID: 6379388
Filing Date: 2002-04-30
Classification: A61F

Abstract:
A tibial prosthesis for implanting into a proximal portion of a tibia, said prosthesis comprising:a tibial plate having a proximal side, a distal side, and a keel extending outwardly from said distal side for insertion into the proximal portion of the tibia; a first, elongate male projection formed on the proximal side of the tibial plate and extending in a first direction; a second, elongate male projection formed on the proximal side of the tibial plate and extending in a second, transverse direction relative to the first direction; and an articular surface component that is removably attachable to the proximal side of the tibial plate, said articular surface component having a distal side and a proximal side and a first elongate recess formed in the distal side and a second elongate recess also formed in said distal side, said first and second recesses being configured, dimensioned and positioned for simultaneously receiving the first and second elongate male projections therein, respectively, such that said male projections are thereby positioned to engage against sidewalls defining said recesses to thereby resist movement of the articular surface component in at least an anterior-posterior direction, a medial-lateral direction, and a rotational direction, and wherein the proximal side of the articular surface component further comprises a bearing surface for engaging in slidable frictional contact with a distal portion of a femur.