There's so many different types of fracture though,I'm positive if he had any kind of serious break there'd be no way,same with pretty much any bone. You can have hairline fractures that are basically a fine crack up to compound fractures which are pretty much a shatter,no body rides with one of those!
Tyler Hamilton rode for 2 weeks with a snapped collarbone. Like minty said, adrenaline can make u do amazing things but that still takes a hard man to do.