Good news is there are supplements that can help with increasing circulation and balancing the body's chemistry. In layman's terms shorten healing time, improve recovery and reduce the chances of ringbone. We have had remarkable luck with it. "Moose" our 17.1 AQHA gelding had sidebone and navicular. After several months on "Silver Lining" supplements, he has recovered enough soundness that he is now able to be trail ridden and his sidebone has completely dissolved. We have also had some horses with similar lower leg injuries, although none cut the artery many went into the coronet band. All healed , some leaving unsightly scars but none ever caused the hoof to be deformed. I would like to think this gives you hope and we will pray for his complete and speedy recovery.