Patent ID: 8142509

Claim:
A patellar implant comprising: a patellar component body comprising: a central axis that generally extends in an anterior-posterior direction; a first surface configured to bear against a patella; a second surface configured to bear against a femoral component, the second surface comprising a superior edge, an inferior edge, a medial edge, and a lateral edge, the second surface further comprising: at least one axis symmetric articulating surface extending between the medial edge surface and the lateral edge, wherein the at least one axis symmetric articulating surface is defined by a plurality of line segments that are oriented to extend outwardly from the central axis, the plurality of line segments of the at least one axis symmetric surface defining curved line segments that are substantially the same within that surface; at least one facet articulating surface located superior to the axis symmetric articulating surface, wherein the at least one facet articulating surface is defined by a plurality of line segments that are oriented to extend outwardly from the central axis, the plurality of line segments of the at least one facet articulating surface defining line segments that are not substantially the same within that surface, and wherein the axis symmetric and facet articulating surfaces generally extend in a superior-inferior direction and a medial-lateral direction.