This wasn't a double blind study (actually these can be manipulated readily to achieve a specific outcome), just based on information received on these cases.
Perhaps it would be beneficial for other non-surgical approaches.
Long bone fractures heal faster after injections of bone-building cells.
Cell Injections Accelerate Fracture Healing
ScienceDaily (2009-02-21) -- Long bone fractures heal faster after injections of bone-building cells. New research has shown that osteoblast cells cultured from a patient's own bone marrow can be injected into the fracture area and can speed the healing process. ... > read full article