a hinged knee prosthesis comprises a tibial component and a femoral component . the tibial component is configured to attach to a tibia . the tibial component has a bearing surface . the femoral component is configured to hingedly attach to the tibial component and rotate relative to the tibial component . the femoral component comprises a medial condyle and a lateral condyle . the medial and lateral condyles have an eccentric sagittal curvature surface configured to rotate and translate on the bearing surface of the tibial component . a method of rotating a hinged knee through a range of flexion is provided . the method fixedly attaches a femoral component to a tibial component . axial rotation of the femoral component is induced relative to the tibial component when the hinged knee is flexed .