Patent ID: 8628580

Claim:
A tibial prosthesis, comprising: a bearing component comprising: at least one concave articulating surface; a distal surface opposite said concave articulating surface; a peripheral wall extending between said articulating surface and said distal surface, said peripheral wall having an anterior bearing edge, an opposing posterior bearing edge, a lateral bearing edge and an opposing medial bearing edge; and a notch formed in said distal surface, said notch defining a bearing undercut; and a tibial tray comprising: a support surface capable of supporting said bearing component, said support surface defining an anterior tray edge, an opposing posterior tray edge, a lateral tray edge and an opposing medial tray edge; a two-pronged boss including a medial prong extending toward said anterior tray edge and having a medially facing side and a laterally facing side, a lateral prong extending toward said anterior tray edge and having a medially facing side and a laterally facing side, and a recess formed between at least a portion of said laterally facing side of said medial prong and at least a portion of said medially facing side of said lateral prong; and a tray undercut extending along said medial tray edge, said posterior tray edge, said lateral tray edge, said medially facing side and said laterally facing side of said medial prong, and said medially facing side and said laterally facing side of said lateral prong; said tray undercut cooperating with said bearing undercut to define an interference fit.