A graft collar includes a body of cylindrical shape, including an upper surface and a spaced apart lower surface defining an outer wall and surface therebetween； an engagement section located on the upper surface of the body sized and shaped to engage a head of a bone fastener； an through hole extending axially through the body between the upper surface and the lower surface thereof, the through hole being sized to receive therethrough an elongate threaded shank extending from the head of the bone fastener, where the graft collar is formed from at least one of soft cadaveric allograft, hard cadaveric allograft, and synthetic bone void fillers.
