Atlanta placed Elder on the 15-day injured list Wednesday due to arthroscopic right knee surgery.
Elder had his knee scoped Tuesday and will miss the remainder of the regular season, though he's aiming to be available at some point during the playoffs. If he does return for the postseason, it would likely be in a relief role. The right-hander has posted a 4.11 ERA, 1.27 WHIP and 121:49 K:BB over 149 innings covering 26 starts for Atlanta this season.