The rock star casualty list: Aidin Vaziri | This week sucks. It should have marked the arrival of U2’s spectacular “360°” tour at the Oakland Coliseum on Wednesday, but the concert was canceled after the group’s lead singer, Bono, injured his back last month during rehearsals in Munich, necessitating emergency surgery and an unspecified period of convalescence. “For a performer who lives to be onstage, this is more than a blow,” said the band’s manager, Paul McGuinness. “He feels robbed of the chance to do what he does best and feels like he has badly let down the band and their audience.” At least Bono can take consolation in knowing he’s not alone. We look back at some other acts whose careers have been sidelined by onstage injuries. Read more.