Tree Repair

We followed advice from the arborist and bolted the fig tree's torn limb back onto the main trunk. It required my handy husband drilling a hole through the limb and the trunk, and then fastening the bolts on while I held the limb up as tight as I could against the trunk. It looks pretty good! My only question is, as the trunk grows, do you need to remove the bolt, or do you just let the trunk grow around it? Perhaps it's just like a human having a piece of metal holding a knee or shoulder together.