The invention relates to a femoral component 2 of a knee prosthesis. The component 2 comprises a curved outer surface for bearing against a tibial component. The curved outer surface includes a posterior end, an anterior end, and an area A. The area A includes no parting lines 10, 14, being imperfections resulting from junctions between mould components during manufacture, without treatment to remove them i.e. the surface is wholly as-moulded. The knee prosthesis may also include ribs 19 and undercut regions defining cement pockets. The invention also extends to tooling apparatus (90, see figure 9) for manufacturing a femoral component. In particular the apparatus comprises mould elements 92, 94, 96 and up and away elements 96, 98, 100, which form parting lines 106, 108 at locations which do not obstruct the use of the femoral component nor cause damage to the tibial bearing surface .
