Mark Ballas is questionable for tonight's (Monday) live performance after suffering a shoulder injury in rehearsals yesterday.

Ballas reportedly hurt his shoulder while lifting his partner, Candace Cameron-Bure. He was treated at a hospital and released, but his status for the final performance is uncertain. Ballas says he is determined to dance, but the show's producers say another dancer is quickly learning the steps in case he needs to fill in. This isn't the first time Ballas has suffered an injury. He dislocated his shoulder during the season-five finale in 2007 while dancing with actress Sabrina Bryan. Tonight's show will feature the final four couples. The two-hour results show airs tomorrow.

photo: abc