According to one aspect of the present invention there is provided a tibial component ( 10 ) suitable for use in an orthopedic prosthesis which prosthesis includes a femoral component and a spacer bearing ( 70 ) the tibial component comprising a planar tibial plate ( 15 ) having an upper bearing surface ( 30 ) and a lower attachment surface ( 20 ) and the tibial plate further having at least one spacer bearing attachment means for removably securing the spacer bearing to the tibial plate.
