"It's going to be a while," Florida coach Kevin Dineen said. "He was pretty sore on the ice, and it wasn't much better off (it)."
Theodore, the 2002 NHL MVP with Montreal, kicked out his right pad to stop Jussi Jokinen on a 2-on-1 rush and immediately crumpled to the ice on the rebound attempt.
He was replaced by Scott Clemmensen after only 2:22 had elapsed in Carolina's eventual 6-2 win.
Theodore (4-6-3) entered play Saturday night with a 3.30 goals-against average and an .892 save percentage. He struggled with knee trouble much of last season.
Information from The Associated Press was used in this report.