Well, on the one hand it's absolutely possible to fracture it and still be able to use it. But on the other hand, I don't know if it's possible in this scenario for it to be broken badly enough that a brace/cast would help it stay in position when it wouldn't otherwise. If that makes sense.
If there is a tiny broken off piece of bone, however, that could float into the wrong place and be very bad indeed. Is there bad bruising too, or just the swelling?
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