E! News said the buckle of Osbourne's shoe was pushed into her foot as she performed a paso doble with her professional partner, Louis van Amstel, on Monday's edition of the show.
When Osbourne later took part in a group number, she was barefoot.
"She is at the hospital right now to take an X-ray and an MRI to make sure she will be OK to dance. Kelly will keep me updated on her prognosis," van Amstel told E! News Monday night.