exemplary embodiments include a mobile bearing tibial tray insert including a medial condyle receiver spaced apart from a lateral condyle receiver , the mobile bearing tibial tray insert also including a stabilizing post , where the mobile bearing tibial tray insert is adapted to rotate around a substantially vertical rotational axis offset laterally from the stabilizing post . in addition , the foregoing embodiments may be supplemented by a tibial tray and femoral component to comprise a total knee replacement system . the disclosure also includes exemplary methods for imparting axial rotation to a prosthetic joint , the method comprising shifting the axis of axial rotation between a tibial prosthesis and a femoral prosthesis of a prosthetic knee joint by providing at least one of offsetting a stabilization post associated with a medial - lateral midline of a tibial insert of the tibial prosthesis , increasing the radii of a medial receiver of the tibial insert of the tibial prosthesis to a greater extent than the radii of a medial condyle of the femoral prosthesis , and increasing conformity between a medial receiver of the tibial insert of the tibial prosthesis and a medial condyle .