Just depends on the horse and the chip size and placement. I've seen horses do fine with them left in. I had surgery done to remove it on my horse. It didn't really bother him but he was only 3 and it was big so I thought it was best to just remove it so it wouldn't hinder his future. He recovered fine and has been sound (he's six now). Probably will do adequin next spring. If your vet thinks it's an option I would maybe try injections first. JMO though.