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Actor Michael Crawford left his London hospital room Wednesday to resume his starring role in the hit musical “Phantom of the Opera” after his understudy injured his knee, Her Majesty’s Theater said. Crawford, 45, had to miss Tuesday night’s performance because of a hiatal hernia, a painful condition in which part of the stomach bulges through the diaphragm. He was replaced by Steve Barton, but Barton sprained his knee during a rehearsal Wednesday and doctors told him not to continue the arduous role because he might permanently damage his knee, said a statement from the theater.