Patent ID: 8771365

Claim:
A tibial implant for a knee arthroplasty in a patient, the tibial implant comprising: (a) a tibial tray sized and shaped generally for placement on a proximal surface of a tibia of the patient and having at least one insert locking mechanism; (b) a first insert comprising a first reciprocal locking mechanism, a first bottom surface for engaging a surface of the tibial tray, a first articular surface portion generally opposite the first bottom surface, and a first thickness extending in a generally perpendicular direction between the first bottom surface and the first articular surface portion; and (c) a second insert comprising a second reciprocal locking mechanism, a second bottom surface for engaging a surface of the tibial tray, a second articular surface portion generally opposite the second bottom surface, and a second thickness extending in a generally perpendicular direction between the second bottom surface and the second articular surface portion; wherein the first thickness is greater than the second thickness, wherein the first articular surface portion or the second articular surface portion, or both, includes patient-adapted sagittal radii or curvature.