It turns out that broken bones do not heal like doctors thought they did. For years it has been thought that fibrin was essential for bone repair. Fibrin is a protein that aids in blood clotting and helps in repairing fractured bones. However, a recent study from Vanderbilt University Medical Center in Nashville, Tennessee suggests that this is not exactly true. According to the researchers at Vanderbilt, it is not the fibrin itself that helps to heal bone fractures, but rather the way in which fibrin breaks down. This research is important because it could help find a way to treat adults and the elderly who suffer from bone fractures heal just as well as children. The study was published in the Journal of Clinical Investigation.