Video: Voeckler's knee pain hampers Tour de France ambitions

The French hero of the 2011 Tour de France is struggling during this year's event. Thomas Voeckler (Europcar) entered the race after a season full of knee problems and hasn't been able to turn things around at the Tour de France. The persistent knee aches threw him out of contention for the general classification on Tuesday. Voeckler crossed the finish line in Boulogne-sur-Mer more than seven minutes behind the front group.