Troy Tulowitzki spent six hours in a Philadelphia doctor's office Wednesday, his career defined more by MRIs than RBIs these days. He was exhausted, frustrated and yet, ironically, relieved. He finally knows what's wrong with his left leg, even if the news was demoralizing for the spiraling Rockies. Tulowitzki will undergo arthroscopic surgery to remove scar tissue irritating a nerve in his groin, likely sidelining the two-time all-star shortstop for eight weeks. The procedure will be performed by Philadelphia specialist Dr. Bill Meyers, whom Tulowitzki flew to visit Monday.