Trout, who tends to set various goals for himself at the start of each spring, said last year that he wanted to steal 40 bases over the 2017 campaign. He ended up stealing only 22, in part because he missed 39 games after tearing a thumb ligament while making a headfirst dive into second base on a stolen-base attempt.
I don't think the injury will dissuade him from being active on the basepaths in 2018, as he now wears a protective glove on his left hand when he gets on base, but he didn't make it an explicit goal again this year and instead said he wants to improve his defense.