A posterior stabilized orthopaedic knee prosthesis comprising: a femoral component including (i) a pair of spaced apart condyles (1704, 1706) defining an intercondylar notch therebetween, at least one of the pair of spaced apart condyles having a condyle surface curved in the sagittal plane and (ii) a posterior cam positioned in the intercondylar notch, and a tibial bearing including (i) a platform having a bearing surface configured to articulate with the condyle surface of the femoral component and (ii) a spine extending upwardly from the platform, in which the condyle surface of the femoral component (i) contacts the bearing surface at a first contact point on the condyle surface at a first degree of flexion (θ1), (ii) contacts the bearing surface at a second contact point on the condyle surface at a second degree of flexion (θ2), the second degree of flexion being greater than the first degree of flexion and in the range of 0 degrees to 75 degrees, and (iii) contacts the bearing surface at a third contact point on the condyle surface at a third degree of flexion (θ3), the third degree of flexion being greater than the second degree of flexion and less than about 90 degrees, in which the condyle surface has a first radius of curvature in the sagittal plane at the first contact point, a second radius of curvature at the second contact point, and a third radius of curvature at the third contact point, characterised in that the condyle surface has a first curved surface section defined between the first contact point and the second contact point, the first curved surface section having a non-constant radius of curvature, and the posterior cam of the femoral component initially contacts the spine of the tibial bearing at a degree of flexion (θC) between the second degree of flexion and the third degree of flexion. a femoral component including (i) a pair of spaced apart condyles (1704, 1706) defining an intercondylar notch therebetween, at least one of the pair of spaced apart condyles having a condyle surface curved in the sagittal plane and (ii) a posterior cam positioned in the intercondylar notch, and a tibial bearing including (i) a platform having a bearing surface configured to articulate with the condyle surface of the femoral component and (ii) a spine extending upwardly from the platform, in which the condyle surface of the femoral component (i) contacts the bearing surface at a first contact point on the condyle surface at a first degree of flexion (θ1), (ii) contacts the bearing surface at a second contact point on the condyle surface at a second degree of flexion (θ2), the second degree of flexion being greater than the first degree of flexion and in the range of 0 degrees to 75 degrees, and (iii) contacts the bearing surface at a third contact point on the condyle surface at a third degree of flexion (θ3), the third degree of flexion being greater than the second degree of flexion and less than about 90 degrees, in which the condyle surface has a first radius of curvature in the sagittal plane at the first contact point, a second radius of curvature at the second contact point, and a third radius of curvature at the third contact point, characterised in that the condyle surface has a first curved surface section defined between the first contact point and the second contact point, the first curved surface section having a non-constant radius of curvature, and the posterior cam of the femoral component initially contacts the spine of the tibial bearing at a degree of flexion (θC) between the second degree of flexion and the third degree of flexion.