Orthopaedic knee prosthesis having increased axial-rotation

An orthopaedic knee prosthesis comprising:

• a tibial bearing configured to be coupled to a tibial tray, the tibial bearing having a platform including a medial condylar bearing surface and a lateral condylar bearing surface and a spine extending upwardly from the platform and positioned between said medial and lateral bearing surfaces, the spine including an anterior surface, a posterior cam surface, a medial sidewall, and a lateral sidewall;
• and
• a femoral component configured to articulate with the tibial bearing, the femoral component having a pair of spaced-apart medial and lateral condyles and a cam box therebetween, the cam box defined by an inner anterior wall, a posterior cam, an inner medial sidewall, and an inner lateral sidewall,
• wherein (i) the medial and lateral sidewalls of the spine are tapered in the anterior-posterior direction when viewed in the transverse plane and (ii) the inner medial and lateral sidewalls of the cam box are tapered in the anterior-posterior direction when viewed in the transverse plane,
• wherein the posterior cam surface of the spine is convex in the transverse plane, and is concave in the sagittal plane, and
• wherein the platform has a centerline axis defined in the anterior-posterior direction when viewed in the transverse plane, and the spine has a longitudinal axis that is angled with respect to the centerline axis of the platform when viewed in the transverse plane.