US gymnast's Olympic comeback

Shawn Johnson, an 18-year-old all-American Olympic heroine, is attempting an almost impossible comeback - to overcome a career-threatening injury and win gold at London 2012.

At the age of 16, she won a gymnastics gold in Beijing and has become one of America's biggest celebrities but her world was turned upside down following a potentially career-ending skiing injury.

She told the BBC's Claire Marshall how she must now shun the celebrity limelight and fight for her dream of more Olympic glory.

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