Autograft is defined as tissue transplanted from one site to another within the same individual. It is basically your very own bone taken from a donor site andplaced somewhere else in the body, into the recipient site.
Allograft is defined as a tissue graft between individuals of the same species but of non-identical genetic composition. the source is usually cadaver bone, which is available in large amounts. This bone hoever has to undergo many different treatment sequences in order to render it neutral to immune reactions and to avoide cross contamination of host diseases.