Moreover, one arrangement of the stabilizing pegs 30, 32, 34 which has been found to be particularly useful for preventing rotation or other types of movement of the glenoid component 10 relative to the scapula 14 is an arrangement shown in FIG. 7 in which a first pair of pegs (i.e. the anchor peg 28 and the stabilizing peg 30) are positioned in a normal relationship with a second pair of pegs (i.