This was a new fracture that was pinned and the stem cell therapy used to help healing. You can log onto http://www.thehorse.com, put 'fracture recovery' into the search box, and it should be the first article to come up - "Fracture Recovery: A Stem Cell Case Study'. If you are not a member, you can 'join' and get an id for free without subscribing.
Tranquility Farm - Proud breeder of Born in the USA Sport Horses, and Cob-sized Warmbloods
Now apparently completely invisible!