LaRoche leads the Nationals' offense in average, on-base percentage, slugging percentage and home runs. He has hit .319 with six doubles, five home runs and 21 RBIs this season.
The loss of LaRoche means a major loss of power at the plate for the Nationals. Over the last three seasons, LaRoche leads the team with 58 home runs. Ryan Zimmerman is second with 53 homers.
The Nationals recalled first baseman Tyler Moore from Syracuse of the Triple-A International League. This marks Moore's second stint with Washington this season.
Moore is hitting .200 with a double, two home runs, three RBIs, three walks and four runs scored in 30 at-bats in 18 games in the big leagues this season. Moore is a career .238 hitter in the majors.