Bone-Knitting Polymer is a material used for medical purposes by the UNSC. It is injected into a wound through a cauterized incision, where it can heal a fractured bone. It is likely that it works in essentially the same way as the bones heal naturally, perhaps creating a small "cast" like human cartilage to set the bone whilst stimulating the osteocytes to reproduce at a higher rate than is normal. Bone-knitting polymer was used on Staff Sergeant Avery Johnson after he was knocked unconscious by Shipmistress Chur'R-Yar aboard the Minor Transgression.