Presentation (insertion) of the fetus is the relationship of the head or buttock to the inlet of the pelvis. In the case of cephalic presentation, continuous attempts to induce labor by frontal insertion of the fetus can lead to delivery by cesarean section (CS). In other cases, a rupture of the perineum or perforation of the uterine fundus may occur due to improper insertion of the fetal head, even during birth in frontal presentation, from the position of the head at the entrance to the pelvis with simultaneous stretching of the utero-pelvic floor. Signs include the configuration of the fetus in the form of a “cube”, as well as an obstetric long loop and a lambdoid configuration of the head/assum of the fetus, which can only be established after their eruption. Stretching of the uterosacral ligaments, especially in the absence of proper manual assistance for an anterior face presentation of the fetus with appropriate anteromedial/dorsal penetration into the cervix, can lead to cervical rupture or transection.
Obstetric and perinatal outcomes of the birth process