The Flyers called up goalie Alex Lyon from AHL affiliate Lehigh Valley on Friday morning.
Elliott, 33. was trying to stop a wraparound goal by Kyle Palmieri at 6:08 of the third period when he suffered the injury. Elliott skated off the ice and was replaced by Cal Pickard, who stopped the only shot he faced.
Elliott has a 6-7-0 record and a 2.59 goals-against average and .911 save percentage, but he has been one of the most valuable players for the 9-9-1 Flyers of late, going 4-2-0 with a 1.47 GAA and .949 save percentage.
Elliott underwent core muscle surgery last season and hip surgery in the offseason.
Pickard has appeared in seven games this season, going 3-1 with a 4.33 GAA and a .865 save percentage.
The Flyers close out a five-game homestand Saturday with an afternoon game against the Tampa Bay Lightning.