Cervical circlage is very much misused surgery. The use of circlage is often questionable. And in cases where circlage seems to have worked, we have to doubt, if it would have gone well, even without cirlage also.
This is a second gravida, first term cesarean, who had short cervix and membranes bulging into cervix in her routine second trimester scan. As her first pregnancy was normal, I told her to continue her pregnancy her normal, without even advising her rest. She has gone to term, and is posted for elective CS today!