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.
