When Kelly Ryan, primary care sports medicine physician for Medstar Health and co-medical director for the Maryland Horsemen's Health Program, discusses with her peers in the sports medicine world her work attending to injured jockeys, she's often met with the sort of wide-eyed puzzlement usually reserved for rare finds. "Every single bad case that we have is almost one in a million--like no other sports medicine doctor has ever seen this type of injury before," Ryan said. "They're all very unique and every single one of them could be a...