A tibial prosthesis comprising a tibial baseplate and a tibial bearing component, wherein the tibial bearing component comprises: an inferior surface; an opposing superior surface defining a lateral articular surface in a lateral portion and a medial articular surface in a medial portion; an anteroposterior axis (A H) 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 peripheral wall extending from said inferior surface to said superior surface, said peripheral wall having a tibial bearing chamfer extending from a posterior medial edge of said superior surface toward said inferior surface, said tibial bearing chamfer extending across at least 25% of an available proximal/distal distance between said superior and said inferior surfaces at said posterior medial edge, said tibial bearing chamfer forming an acute bearing chamfer angle (α) with said inferior surface such that said bearing chamfer extends proximally and anteriorly from said inferior surface toward said superior surface; wherein the tibial baseplate comprises: a bone contacting surface; an opposing baseplate superior surface defining a medial compartment, a lateral compartment; a baseplate anteroposterior axis (A H) disposed between said lateral compartment and said medial compartment, said baseplate anteroposterior axis (A H) extending from an anterior edge to a posterior edge of said tibial baseplate; and a baseplate peripheral wall extending from said bone contacting surface to said baseplate superior surface, said baseplate peripheral wall including a baseplate chamfer extending from a posterior portion of said medial compartment to said bone contacting surface, said baseplate chamfer defining an acute baseplate chamfer angle with said bone contacting surface; and wherein when said tibial bearing component is mounted to said tibial baseplate, the medial portion of the tibial bearing component only extends posteriorly as far as the anterior end of chamfer. an inferior surface; an opposing superior surface defining a lateral articular surface in a lateral portion and a medial articular surface in a medial portion; an anteroposterior axis (A H) 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 peripheral wall extending from said inferior surface to said superior surface, said peripheral wall having a tibial bearing chamfer extending from a posterior medial edge of said superior surface toward said inferior surface, said tibial bearing chamfer extending across at least 25% of an available proximal/distal distance between said superior and said inferior surfaces at said posterior medial edge, said tibial bearing chamfer forming an acute bearing chamfer angle (α) with said inferior surface such that said bearing chamfer extends proximally and anteriorly from said inferior surface toward said superior surface; a bone contacting surface; an opposing baseplate superior surface defining a medial compartment, a lateral compartment; a baseplate anteroposterior axis (A H) disposed between said lateral compartment and said medial compartment, said baseplate anteroposterior axis (A H) extending from an anterior edge to a posterior edge of said tibial baseplate; and a baseplate peripheral wall extending from said bone contacting surface to said baseplate superior surface, said baseplate peripheral wall including a baseplate chamfer extending from a posterior portion of said medial compartment to said bone contacting surface, said baseplate chamfer defining an acute baseplate chamfer angle with said bone contacting surface; and wherein when said tibial bearing component is mounted to said tibial baseplate, the medial portion of the tibial bearing component only extends posteriorly as far as the anterior end of chamfer.