A tibial bearing component (12, 212) for articulation with femoral condyles, the tibial bearing component defining a tibial bearing component coordinate system comprising: a bearing component transverse plane extending along a medial/lateral direction and an anterior/posterior direction; a bearing component coronal plane extending along a proximal/distal direction and the medial/lateral direction, the bearing component coronal plane perpendicular to the bearing component transverse plane; and a bearing component sagittal plane extending along the anterior/posterior direction and the proximal/distal direction, the bearing component sagittal plane perpendicular to the bearing component transverse plane and the bearing component coronal plane, said tibial bearing component comprising: an articular surface and an opposing distal surface (60, 260), said distal surface parallel to the bearing component transverse plane, said articular surface including medial and lateral dished articular compartments (16, 18; 216, 218) sized and shaped for articulation with the femoral condyles, said medial and lateral dished articular compartments separated from one another by the bearing component sagittal plane, said articular and distal surfaces bounded by a tibial bearing periphery, an anterior relief space (61, 261) situated at a medial/lateral location between said medial and lateral dished articular surfaces to define a medial/lateral span (D T), said anterior relief space situated adjacent to an anterior edge of said tibial bearing periphery and extending posteriorly from said anterior edge across an anterior/posterior span, said medial/lateral span of said anterior relief space comprising a plurality of sagittal cross-sectional profiles each extending from a posterior edge of said anterior relief space to an anterior edge of said anterior relief space, each of said plurality of sagittal cross-sectional profiles defining a convex sagittal curve (262, 264, 266) extending from said posterior edge to said anterior edge of said anterior relief space, characterised in that a coronal cross-section of said anterior relief space (61, 261) defines a concave medial/lateral profile. a bearing component transverse plane extending along a medial/lateral direction and an anterior/posterior direction; a bearing component coronal plane extending along a proximal/distal direction and the medial/lateral direction, the bearing component coronal plane perpendicular to the bearing component transverse plane; and a bearing component sagittal plane extending along the anterior/posterior direction and the proximal/distal direction, the bearing component sagittal plane perpendicular to the bearing component transverse plane and the bearing component coronal plane, said tibial bearing component comprising: an articular surface and an opposing distal surface (60, 260), said distal surface parallel to the bearing component transverse plane, said articular surface including medial and lateral dished articular compartments (16, 18; 216, 218) sized and shaped for articulation with the femoral condyles, said medial and lateral dished articular compartments separated from one another by the bearing component sagittal plane, said articular and distal surfaces bounded by a tibial bearing periphery, an anterior relief space (61, 261) situated at a medial/lateral location between said medial and lateral dished articular surfaces to define a medial/lateral span (D T), said anterior relief space situated adjacent to an anterior edge of said tibial bearing periphery and extending posteriorly from said anterior edge across an anterior/posterior span, said medial/lateral span of said anterior relief space comprising a plurality of sagittal cross-sectional profiles each extending from a posterior edge of said anterior relief space to an anterior edge of said anterior relief space, each of said plurality of sagittal cross-sectional profiles defining a convex sagittal curve (262, 264, 266) extending from said posterior edge to said anterior edge of said anterior relief space, characterised in that a coronal cross-section of said anterior relief space (61, 261) defines a concave medial/lateral profile. an articular surface and an opposing distal surface (60, 260), said distal surface parallel to the bearing component transverse plane, said articular surface including medial and lateral dished articular compartments (16, 18; 216, 218) sized and shaped for articulation with the femoral condyles, said medial and lateral dished articular compartments separated from one another by the bearing component sagittal plane, said articular and distal surfaces bounded by a tibial bearing periphery, an anterior relief space (61, 261) situated at a medial/lateral location between said medial and lateral dished articular surfaces to define a medial/lateral span (D T), said anterior relief space situated adjacent to an anterior edge of said tibial bearing periphery and extending posteriorly from said anterior edge across an anterior/posterior span, said medial/lateral span of said anterior relief space comprising a plurality of sagittal cross-sectional profiles each extending from a posterior edge of said anterior relief space to an anterior edge of said anterior relief space, each of said plurality of sagittal cross-sectional profiles defining a convex sagittal curve (262, 264, 266) extending from said posterior edge to said anterior edge of said anterior relief space, characterised in that a coronal cross-section of said anterior relief space (61, 261) defines a concave medial/lateral profile.