The ability to repair a broken human bone within days is moving closer to reality, thanks to Fracture Putty. From Geek.com:

“Speeding up the time it takes to heal a broken bone is highly desirable, and a solution may be on the horizon. Research being carried out at the University of Georgia Regenerative Bioscience Center has helped create a new gel being referred to as Fracture Putty. It’s major benefit to those suffering broken bones is its ability to heal them in just a few days, or in the case of severe breaks, cut the healing time to weeks instead of months.

Fracture Putty has yet to be tested on humans, but it has already been proven to work in animals. The putty takes the form of a gel that gets injected into the broken bones. It then goes to work rapidly generating bone much faster than a body can achieve on its own.

The key to Fracture Putty is the use of mesenchymal stem cells that produce a protein key to bone generation. The cells survive long enough after injection into the patient to cause a rapid generation of new bone, thus healing it very quickly.

The time it takes to heal depends on the severity of the fracture, but in all cases it should speed up the process. In cases where complex or multiple bone fractures have a occurred, Fracture Putty could mean the difference between losing a limb and making a full recovery.”