I wasa told the swelling in my horses leg (recent purchase) was calcification from an old kick. Had x-ray done and sure enough it was a broken splint bone. Many broken splints are not a huge deal but it depends on HOW it is broken. My horse had to have surgury due to the fact that the way it was broken, could cause damage to the suspensory ligament. I could have gambled on it never becoming an issue but to me it is not worth the gaamble of my new horse coming up lame. Still in recovery mode but she seems to be doing ok.