Pope Francis has revealed that he will undergo injections to ease severe pain in his knee.

During an interview with the Italian daily Corriere della Sera, the Pope said that he has been handicapped by the knee problem, which he described as a torn ligament. Although he has had the problem “for a long time,” he said, it has recently become severe and now “I can’t walk.”

Pope Francis has apologized for remaining seated during his most recent audiences, saying that he is obeying doctors’ orders. He reports that he finds it humiliating.