He missed the final 10 games of the season in 2014 after he was fallen on in the crease and injured his leg:
https://www.youtube.com/watch?v=MaLbIk5SjEA
He missed 12 games last season after twisting awkwardly trying to make a save and hurt his leg again:
http://www.sportsnet.ca/hockey/nhl/c...loss-senators/
In 2015-16, he missed 40 games after having "core muscle" surgery. I can't find video of this one. It seems like it was more of a cumulative injury that he tried to play through before they decided surgery was the best solution.
Those appear to be the only major injuries he's had since going to the Coyotes.