A tibial bearing component (12, 112, 212) for articulation with a medial femoral condyle and a lateral femoral condyle, 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, said bearing component coronal plane perpendicular to said bearing component transverse plane; and a bearing component sagittal plane extending along the anterior/posterior direction and the proximal/distal direction, said bearing component sagittal plane perpendicular to said bearing component transverse plane and said bearing component coronal plane, said tibial bearing component (12, 112, 212) comprising: an articular surface and an opposing distal surface (60, 160, 260), said distal surface parallel to the bearing component transverse plane, said articular surface including medial and lateral articular compartments (16, 18; 116, 118; 216; 218) sized and shaped for articulation with the medial and lateral femoral condyles respectively, said medial and lateral articular compartments separated from one another by the bearing component sagittal plane, wherein said medial articular compartment (16, 116, 216) is dished, characterised in that said lateral articular compartment (18, 118, 218) is also dished, said lateral articular compartment (18, 118, 218) comprising a plurality of coronal cross-sectional profiles defining a lateral set of coronal distal-most points spanning a lateral anterior/posterior extent (AP L), said lateral set of coronal distal-most points defining a lateral articular track (28, 128, 228), said lateral articular track having an anterior portion and a posterior portion, said anterior portion defining a nominally straight line when projected onto the bearing component transverse plane, said posterior portion defining a curved line when projected onto the bearing component transverse plane. 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, said bearing component coronal plane perpendicular to said bearing component transverse plane; and a bearing component sagittal plane extending along the anterior/posterior direction and the proximal/distal direction, said bearing component sagittal plane perpendicular to said bearing component transverse plane and said bearing component coronal plane, an articular surface and an opposing distal surface (60, 160, 260), said distal surface parallel to the bearing component transverse plane, said articular surface including medial and lateral articular compartments (16, 18; 116, 118; 216; 218) sized and shaped for articulation with the medial and lateral femoral condyles respectively, said medial and lateral articular compartments separated from one another by the bearing component sagittal plane, wherein said medial articular compartment (16, 116, 216) is dished, characterised in that said lateral articular compartment (18, 118, 218) is also dished, said lateral articular compartment (18, 118, 218) comprising a plurality of coronal cross-sectional profiles defining a lateral set of coronal distal-most points spanning a lateral anterior/posterior extent (AP L), said lateral set of coronal distal-most points defining a lateral articular track (28, 128, 228), said lateral articular track having an anterior portion and a posterior portion, said anterior portion defining a nominally straight line when projected onto the bearing component transverse plane, said posterior portion defining a curved line when projected onto the bearing component transverse plane.