[Cervix cerclage. A 20-year case load].

Uterine cervical incompetence is the most common cause of habitual abortion in the second trimester of pregnancy and premature delivery; cervical cerclage still represents the only surgical treatment for cervical incompetence. In the last 20 years (1971-1990) we performed 272 Mac Donald cervical cerclages in patients between the 8th and the 34th week of pregnancy. In 16 cases the outcome of pregnancy is unknown; 198 women (73.3%) subsequentely delivered healthy infants later than 37 weeks' gestation or weighing more than 2500 g.