Tue 24 Mar, 2009
Armstrong sustained a fractured collarbone, or clavicle, when he went over the top of his handlebars as part of a multi-cyclist collision near the end of the opening stage of the Vuelta a Castilla y Leon. Clavicle fractures make up roughly 5 percent of all fractures in the general population, and of those, fractures in the middle third of the bone (where Armstrong is reported to have suffered his injury) comprise 85 percent. These fractures are typically caused by a fall onto the arm or shoulder, which, with cyclists, usually results from going over the handlebars, but can also result from a fall on the side.
goTo : http://sports.espn.go.com/oly/cycling/news/story?id=4010909



