A tibial prosthesis wherein the prosthesis is a tibial baseplate having a proximal surface and an opposing distal surface , said distal surface comprising a bone contacting surface and said proximal surface comprising a tibial bearing engagement surface, said prosthesis further comprising an asymmetric prosthesis periphery, said periphery comprising: an anteroposterior axis dividing said prosthesis periphery into a medial compartment and a lateral compartment; an anterior edge disposed between said medial compartment and said lateral compartment; 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: an anterior-lateral arc having an anterior-lateral arc center (C2L); and a lateral arc having a lateral arc center (C3L), said lateral arc defining a tangent parallel to said anteroposterior axis; a medial periphery extending from said anterior edge to said medial posterior edge, said medial periphery defining: an anterior-medial arc having an anterior-medial arc center (CIR); and a medial arc having a medial arc center (C2R), said medial arc defining a tangent parallel to said anteroposterior axis, a mediolateral axis (A ML ) defining the longest line segment within said prosthesis periphery that is also perpendicular to said anteroposterior axis, said anterior-lateral arc center disposed between said mediolateral axis and said anterior edge, said anterior-medial arc center disposed posterior of said mediolateral axis. an anteroposterior axis dividing said prosthesis periphery into a medial compartment and a lateral compartment; an anterior edge disposed between said medial compartment and said lateral compartment; 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: an anterior-lateral arc having an anterior-lateral arc center (C2L); and a lateral arc having a lateral arc center (C3L), said lateral arc defining a tangent parallel to said anteroposterior axis; an anterior-lateral arc having an anterior-lateral arc center (C2L); and a lateral arc having a lateral arc center (C3L), said lateral arc defining a tangent parallel to said anteroposterior axis; a medial periphery extending from said anterior edge to said medial posterior edge, said medial periphery defining: an anterior-medial arc having an anterior-medial arc center (CIR); and a medial arc having a medial arc center (C2R), said medial arc defining a tangent parallel to said anteroposterior axis, an anterior-medial arc having an anterior-medial arc center (CIR); and a medial arc having a medial arc center (C2R), said medial arc defining a tangent parallel to said anteroposterior axis, a mediolateral axis (A ML ) defining the longest line segment within said prosthesis periphery that is also perpendicular to said anteroposterior axis, said anterior-lateral arc center disposed between said mediolateral axis and said anterior edge, said anterior-medial arc center disposed posterior of said mediolateral axis. <EOS>