I recently got a 14 year old horse with bone spavins. I have done some reading on them and his are fused. Has anyone had any experience with a horse with bone spavins once they are fused? Can they become a problem sometime down the line if a horse is not ridden hard? He is very sound now and runs and jumps around the pasture without a probem. I am just wondering if they can become painful after they have fused.