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.
Astronomers offer more expansive view of universe
McPhee, Cokas 'working on their marriage' after affair