According to a study done by the Georgetown University School of Medicine, hockey fights are actually relatively safe.
"I've watched enough hockey that I can tell you clearly that if you take the release valve of fighting out of it, you'd have a lot more dirty playing, and probably more injuries would result from players not being able to blow off steam by fighting"-Dr. David Milzman (qtd. in Dotinga).
Hockey players have only a .39% chance of getting a concussion from fighting, as opposed to the 4.5% chance of getting a concussion from being checked (Dotinga).
Furthermore, in almost 15,000 fights studied, there was not a single jaw fracture or break, whereas in a study relating to bar fights, a broken jaw occurs over 50% of the time (Dotinga).