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.

中文翻译：

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骨盆入口和出口平面直径与女性骨盆底功能障碍之间的相关性研究。

目的探讨骨盆入口和出口平面的关键直径与女性骨盆底功能障碍（FPFD）之间的相关性。研究设计通过测量298例FPFD患者和对照组508例患者的骨盆进出平面的两个直径（即骨盆入口的前后直径和骨盆出口的横向直径）来分析与FPFD的相关性相关因素。结果实验组骨盆出口横径明显大于对照组（9.55cm vs.8.50cm，P <0.01）。两组盆腔入口前后径的差异无统计学意义（11.63cm vs. 11.26cm，P = 0.205> 0.01）。二元逻辑回归分析表明，骨盆入口的前后直径与FPFD的发生率无关，但骨盆出口的横向直径是FPFD的影响因素之一。结论骨盆出口的横径与FPFD的发生率密切相关，是FPFD的危险因素之一。骨盆出口的横截面直径大于9.5厘米是FPFD发作的阈值，可以用作FPFD的早期预测指标。