Like O'Loughlin, Scott Caan found himself banged up very early in Hawaii Five-0's run. In August 2010, he was forced to return to the U.S. mainland for ACL surgery when he reaggravated a previous knee injury, per Entertainment Online. Rather than halting production on the fledgling series, though, writers quickly moved to turn the injury into a funny character-building moment.
In the episode "Lanakila," Steve and Danno are paying a visit to Dr. Teddy Oh to take stock of the latter's ailments. When asked about his injuries, Danno responds, "This guy is like a physical injury, Doc. Ah, 10 minutes after meeting him, I get shot and blasted backwards through a window, okay? A few hours after that, he drives a car — not joking — onto the deck of a Chinese freighter ship. And, yes, I was in it. The car, not the ship."
Fans will also recall that Danno could be seen wearing an arm brace on multiple episodes airing in 2017. As relayed by Closer Weekly, TV writer Rob Owen did some digging and was eventually informed by a CBS publicist that Caan had "hurt his arm in real life while not working on the series so the injury was written into the show."
Apparently, Caan and Danno just have the same incredible knack for getting beaten up.
