Investigation of correlation between diameters of pelvic inlet and outlet planes and female pelvic floor dysfunction

ObjectiveTo investigate correlation between key diameters of pelvic inlet and outlet planes and female pelvic floor dysfunction (FPFD).Study designCorrelation with incidence of FPFD was analyzed by measuring the two diameters of pelvic inlet and outlet planes (i.e. anteroposterior diameter of pelvic inlet and transverse diameter of pelvic outlet) in 298 patients with FPFD and 508 patients in control group taking into account of other relevant factors.ResultsThe transverse diameter of pelvic outlet was significantly larger in experimental group than in control group (9.55 cm vs. 8.50 cm, P < 0.01); while the difference in anteroposterior diameter of pelvic inlet between the two groups was not statistically significant (11.63 cm vs. 11.26 cm, P = 0.205 > 0.01); Binary logistic regression analysis indicated that the anteroposterior diameter of pelvic inlet was not correlated with incidence of FPFD, but the transverse diameter of pelvic outlet was one of the influencing factor for FPFD.ConclusionsThe transverse diameter of pelvic outlet is closely correlated with incidence of FPFD and represents one of the risk factors for FPFD; a transverse diameter of pelvic outlet greater than 9.5 cm is the threshold for onset of FPFD and can be used as an early predictive index for FPFD.