The moment that caused the injury was not immediately clear.
It’s been less than a month since the goalie’s late-season debut on Nov. 15 after he missed the first month of the season due to a personal family matter.
The Maple Leafs are in all-around goalie trouble, with their other key netminder also out with an upper-body injury. Anthony Stolarz has no timeline for his return.
Hildeby has played six games so far this season and boasts a .914 save percentage with one win.