ankle fracture data (articles)

http://www.ncbi.nlm.nih.gov/pubmed/16375062

http://aol.sportingnews.com/nfl/feed/2010-10/vikingspackers/story/brad-childress-brett-favre-has-ankle-fractures

http://bleacherreport.com/articles/422500-brett-favres-ankle-and-the-11-injuries-sports-fans-should-know-about

http://www.nhl.com/ice/blogpost.htm?id=4014

http://www.nfl.com/draft/2011/profiles/lesean-mccoy?id=79607