RAPTOS allograft cancellous and cortical bone offers an osteoconductive scaffold for promoting bone regeneration. Used either alone or as part of a composite bone graft, cancellous bone supplies a natural scaffold facilitating the attachment of osteogenic precursor cells. Cortico-cancellous - bone comes from sections of the illium which are ground into several particulate sizes. The blend of cortical and cancellous that results from this process gives this product the structure of cortical, with the open scaffolding for bone to grow into offered by cancellous.