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The sport that leads to the most doctor visits. At its worst, football can put a player`s head and spine at risk, though other injuries are more common. Barry Boden, an orthopedic surgeon in Rockville, Md., who studies catastrophic sports injuries, notes that concussions are a frequent occurrence, with 900 National Football League players suffering from a concussion between 1996 and 2001. Another problem is speed. It`s common to get hit unexpectedly from several directions at once, making it difficult to brace for the attack.