"My injury was actually a lot worse than just a labral tear," said Gaga, 27, who has a new album, titled "ARTPOP," dropping on Nov. 11.
"I had broken my hip," she said. "Nobody knew, and I haven't even told the fans yet. But when we got all the MRIs finished before I went to surgery there were giant craters, a hole in my hip the size of a quarter, and the cartilage was just hanging out the other side of my hip."
She added, "I had a tear on the inside of my joint and a huge breakage. The surgeon told me that if I had done another show I might have needed a full hip replacement. I would have been out at least a year, maybe longer."
And that would not have flown with the pop star, who told WWD that she hasn't gone without performing for more than two weeks since she was 14 years old.