Dr. Bryan Kelly is the hip specialist Devin Mesoraco went to see in New York. Dr. Kelly has operated on more than 100 professional athletes over the past decade, including New York Yankee Alex Rodriguez. Kelly has also done hip surgery for Lady Gaga. The pioneering Manhattan surgeon is co-director of the Center for Hip Preservation at the Hospital for Special Surgery. He has literally written the book (just $99.95 for a soft cover edition) on the hip arthroscopy that Mesoraco will need to fix his hip impingement. Kelly does 500 of those two-hour surgeries a year.