Patent ID: 8613775

Claim:
A tibial prosthesis comprising an asymmetric prosthesis periphery, said prosthesis comprising: a distal surface; a proximal surface generally opposite said distal surface, said proximal surface having a lateral compartment and a medial compartment; and a peripheral wall extending between said distal and said proximal surface, said peripheral wall defining: an anterior edge; a lateral posterior edge generally opposite said anterior edge and forming a posterior boundary of said lateral compartment; a medial posterior edge generally opposite said anterior edge and forming a posterior boundary of said medial compartment; a lateral periphery extending from said anterior edge to said lateral posterior edge, said lateral periphery defining a plurality of adjacent lateral arcs, an adjacent pair of said plurality of adjacent lateral arcs defining a first lateral radius and a second lateral radius, respectively, said first lateral radius larger than said second lateral radius by at least 100%, whereby said lateral periphery is relatively boxy; and a medial periphery extending from said anterior edge to said medial posterior edge, said medial periphery defining a plurality of adjacent medial arcs, an adjacent pair of said plurality of adjacent medial arcs defining a first medial radius and a second medial radius, respectively, said first medial radius larger than said second medial radius by less than 75%, whereby said medial periphery is generally rounded, wherein said tibial prosthesis comprises a tibial baseplate and a tibial bearing component, said tibial baseplate including an anterior-lateral corner defining an anterior-lateral corner radius having a first radial center, and an anterior-medial corner defining an anterior-medial corner radius having a second radial center, said tibial bearing component comprising: a lateral portion defining an anterior-lateral bearing corner defining a third radius having a third radial center, said third radial center substantially coincident with said first radial center in a transverse plane when said tibial bearing component is mounted to said tibial baseplate, said third radius smaller than said anterior-lateral comer radius; and a medial portion defining an anterior-medial bearing corner defining a fourth radius having a fourth radial center, said fourth radial center substantially coincident with said second radial center in the transverse plane when said tibial bearing component is mounted to said tibial baseplate, said fourth radius smaller than said anterior-medial corner radius, said fourth radius substantially larger than said third radius, wherein said lateral periphery is asymmetric with respect to said medial periphery about an anteroposterior axis.