Rocker Ozzy Osbourne withdrew from Tuesday's Royal Variety Performance because of a painful plate in his shoulder from a year-old accident, the BBC reported.
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Sir Elton John and Liza Minnelli also were on tap for the show to be aired Wednesday.
Osbourne was seriously injured in a so-called "quad" bike accident last year that required a metal plate in his shoulder. That area is the one now in pain, and additional surgery is required, a spokesman for his record company told the BBC.