RESUMO
OBJECTIVE: To investigate correlation between key diameters of pelvic inlet and outlet planes and female pelvic floor dysfunction (FPFD). STUDY DESIGN: Correlation 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. RESULTS: The transverse diameter of pelvic outlet was significantly larger in experimental group than in control group (9.55cm vs. 8.50cm, P<0.01); while the difference in anteroposterior diameter of pelvic inlet between the two groups was not statistically significant (11.63cm vs. 11.26cm, 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. CONCLUSIONS: The 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 9.5cm is the threshold for onset of FPFD and can be used as an early predictive index for FPFD.