He might take issue with "clumsy," but essentially you're right.

Actor Scott Caan is in fact a multi-sport athlete and suffers the frequent bumps and bruises -- and torn anterior cruciate ligaments -- that come with that.

It was a ligament injury that put him on crutches and a knee brace in the first season way back in 2010. At first it was reported that he hurt it performing a stunt on set, but he later admitted that his opponent tore it for him in a Brazilian jiu-jitsu match.

In the most recent season, his character was wearing an arm brace at one point. A CBS publicist explained to Pittsburgh Post-Gazette writer Rob Owen that "Mr. Caan hurt his arm in real life while not working on the series."

There's not a lot of detail in that last answer, but on top of martial arts, Caan is also an avid surfer (unlike his "Five-0" character) and bodybuilder, both of which can be hard on the body.

CBS and the "Five-0" writers are being good sports about it, if you'll pardon the pun. As you say, they've written his various off-set injuries into the scripts. For example, they addressed his first-season knee injury by giving Caan's character, Danny, a trip to the doctor, which he used as an opportunity to complain about his new partner, Steve McGarrett (Alex O'Loughlin).

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