A tibial prosthesis comprising: a distal surface; a proximal surface generally opposite said distal surface; and a peripheral wall extending between said distal and said proximal surface, said peripheral wall defining: an anterior edge; a lateral periphery including: a lateral edge defining a substantially perpendicular tangent with respect to said anterior edge, an anterior-lateral corner traversing an angular sweep between said anterior edge and said lateral edge to define an anterior-lateral corner edge length, and a posterior-lateral corner extending away from said lateral edge and said anterior-lateral corner; and a medial periphery including: a medial edge defining a substantially perpendicular tangent with respect to said anterior edge, an anterior-medial corner traversing an angular sweep between said anterior edge and said medial edge to define an anterior-medial corner edge length that is longer than the anterior-lateral corner edge length, in which the angular sweep between said anterior edge and said medial edge is similar to the angular sweep between said anterior edge and said lateral edge, and a posterior-medial corner extending away from said medial edge and said anterior-medial corner; said anterior-medial corner defines an anterior-medial corner arc defining an anterior-medial corner radius (R1R), said anterior-lateral corner defines an anterior-lateral corner arc defining an anterior-lateral corner radius (R2L), and said anterior-medial corner radius is different from said anterior-lateral corner radius by as little as 48.1% and as much as 149.2%. a distal surface; a proximal surface generally opposite said distal surface; and a peripheral wall extending between said distal and said proximal surface, said peripheral wall defining: an anterior edge; a lateral periphery including: a lateral edge defining a substantially perpendicular tangent with respect to said anterior edge, an anterior-lateral corner traversing an angular sweep between said anterior edge and said lateral edge to define an anterior-lateral corner edge length, and a posterior-lateral corner extending away from said lateral edge and said anterior-lateral corner; and a medial periphery including: a medial edge defining a substantially perpendicular tangent with respect to said anterior edge, an anterior-medial corner traversing an angular sweep between said anterior edge and said medial edge to define an anterior-medial corner edge length that is longer than the anterior-lateral corner edge length, in which the angular sweep between said anterior edge and said medial edge is similar to the angular sweep between said anterior edge and said lateral edge, and a posterior-medial corner extending away from said medial edge and said anterior-medial corner; an anterior edge; a lateral periphery including: a lateral edge defining a substantially perpendicular tangent with respect to said anterior edge, an anterior-lateral corner traversing an angular sweep between said anterior edge and said lateral edge to define an anterior-lateral corner edge length, and a posterior-lateral corner extending away from said lateral edge and said anterior-lateral corner; and a lateral edge defining a substantially perpendicular tangent with respect to said anterior edge, an anterior-lateral corner traversing an angular sweep between said anterior edge and said lateral edge to define an anterior-lateral corner edge length, and a posterior-lateral corner extending away from said lateral edge and said anterior-lateral corner; and a medial periphery including: a medial edge defining a substantially perpendicular tangent with respect to said anterior edge, an anterior-medial corner traversing an angular sweep between said anterior edge and said medial edge to define an anterior-medial corner edge length that is longer than the anterior-lateral corner edge length, in which the angular sweep between said anterior edge and said medial edge is similar to the angular sweep between said anterior edge and said lateral edge, and a posterior-medial corner extending away from said medial edge and said anterior-medial corner; a medial edge defining a substantially perpendicular tangent with respect to said anterior edge, an anterior-medial corner traversing an angular sweep between said anterior edge and said medial edge to define an anterior-medial corner edge length that is longer than the anterior-lateral corner edge length, in which the angular sweep between said anterior edge and said medial edge is similar to the angular sweep between said anterior edge and said lateral edge, and a posterior-medial corner extending away from said medial edge and said anterior-medial corner; said anterior-medial corner defines an anterior-medial corner arc defining an anterior-medial corner radius (R1R), said anterior-lateral corner defines an anterior-lateral corner arc defining an anterior-lateral corner radius (R2L), and said anterior-medial corner radius is different from said anterior-lateral corner radius by as little as 48.1% and as much as 149.2%.