Safely haul your horse to the veterinarian for treatment. The November 2004 feature "Fracture Repair" discusses how veterinarians handle the injuries. In some cases, you must haul your injured horse to the veterinary clinic for treatment. Consider these points when transporting a horse with a fracture.
Long-distance trailering can be hard on a horse. Besides subjecting him to long periods of confinement within a mini-climate he can't escape, a trailer trip also challenges his sense of balance as he's hurtled down the highway. And that's in a best-case scenario; the risks and challenges multiply with poor planning and unforeseen circumstances.