Osbourne has said he will never go on a quad bike again

The star told US TV show Primetime the thought of not being able to perform scared him.

"I'm really frightened because music is the love of my life," he said.

Osbourne, who has had well-documented problems with substance abuse, also fears he may be addicted to painkillers he was prescribed after the accident.

"I've been fighting that battle for nearly 20 years. I can't just stop," he told the ABC programme.

The 55-year-old suffered eight broken ribs, a smashed collarbone, a punctured lung and a crushed vertebra in his neck after the crash on his Buckinghamshire estate.

The former Black Sabbath singer was in a coma for eight days and was saved by his bodyguard Sam Ruston, who gave Osbourne mouth-to-mouth resucitation.