Elf On A Shelf
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Maybe they needed to get it to a good vet facility and x rays before making a final decision. I have seen a very bad tendon injury and thought it was a broken leg - the horse lived on for many years.
There is quite a huge difference between a bad tendon injury and a catastrophic bone injury. A soft tissue injury the fetlock would drop to the floor and the hooves movement would be sloppy because of the lack of support but the leg would not be able to swing in circles. I took a horse home from work with a 100% rupture to his SDFT knowing full well I could put him down 6 months later. But he turned into the soundest horse I ever had once over the injury.
A catastrophic broken bone would result in the leg literally hanging, swinging in the breeze. A broken bone that could potentially be fixed the limb would not swing but the horse would be non-weight bearing lame. These ones you splint and bandage up, drug up the horse then hop them into the ambulance for xrays back in the stable yard.