Patent ID: 8591594

Claim:
A tibial prosthesis comprising: a tibial baseplate comprising a baseplate inferior surface configured for contacting a bone surface; an opposing baseplate superior surface defining a medial compartment, a lateral compartment, and a baseplate periphery; a baseplate anteroposterior axis disposed between said lateral compartment and said medial compartment, said baseplate anteroposterior axis extending from an anterior edge to a posterior edge of said tibial baseplate; a baselate peripheral wall extending from said baseplate inferior surface to said baseplate periphery; and said baseplate peripheral wall of said tibial baseplate includes a baseplate chamfer extending from a posterior portion of said medial compartment of said tibial baseplate to said baseplate inferior surface of said tibial baseplate, said baseplate chamfer defining an acute baseplate chamfer angle with said baseplate inferior surface; a tibial bearing component mountable to said tibial baseplate and comprising: an bearing inferior surface; an opposing bearing superior surface defining a lateral articular surface and a medial articular surface; a bearing anteroposterior axis disposed between said lateral articular surface and said medial articular surface and extending from an anterior edge to a posterior edge of said tibial bearing component; and a bearing peripheral wall extending from said bearing inferior surface to said bearing superior surface, said bearing peripheral wall having a tibial bearing chamfer extending from a posterior medial edge of said bearing superior surface toward a posterior medial edge of said bearing inferior surface, said tibial bearing chamfer extending across at least 25% of an available proximal/distal distance between said bearing superior and said bearing inferior surfaces, said tibial bearing chamfer forming an acute bearing chamfer angle with said bearing inferior surface such that said bearing chamfer extends proximally and anteriorly from said bearing inferior surface toward said bearing superior surface, wherein said baseplate peripheral wall extends in a posterior direction beyond the posterior medial edge of said bearing inferior surface such that said bearing inferior surface is sized to fit within said baseplate periphery when said tibial bearing component is mounted to said tibial baseplate.