This invention is a biodegradable synthetic bone augment or graft that promotes bone healing in large defects. The cement is applied as a liquid, gel, or foam which fills irregular defects, and then quickly polymerizes into a bone-like solid. The material provides scaffolding for cell migration from nearby healthy bone. Colonization is accelerated by placing stem cells, derived from the patient prior to the procedure, in the material. These cells subsequently differentiate into bone cells.