Implantable mobile bearing prosthetics

A knee replacement system comprising:

• a tibial baseplate comprising a tibia facing surface and a superior surface, wherein the superior surface defines a cavity positioned medially on the superior surface;
• a femoral implant comprising a cam feature, a pair of condyles and a femur facing surface;
• a tibial insert comprising a tibial baseplate facing side, a femoral implant facing side, a lateral articulating surface, and a medial articulating surface, and wherein the tibial baseplate facing side defines a boss positioned medially on the tibial baseplate facing side that is rotatable within the cavity to enable a pivotal articulation of the tibial baseplate facing side with the superior surface about a medially-displaced axis, wherein each of the medial and lateral articulating surfaces are shaped and positioned to articulate with the pair of condyles;
• the tibial insert further comprising an arc-shaped channel passing through the tibial baseplate facing side of the tibial insert, the arc-shaped channel tibial being concave toward the medial articulating surface;
• and
• a post protruding from the superior surface and passing through the arc-shaped channel, wherein the pivotal articulation is provided at least partially by contact of an anterior side of the cam feature with a posterior side of the post during articulation of the pair of condyles with the medial and lateral articulating surfaces.