Anatomical variation of bony pelvis from the viewpoint of transobturator sling placement for stress urinary incontinence

Introduction and hypothesis The aim of the study was to investigate the variability of bony pelvis architecture from the viewpoint of transobturator sling placement. Methods The pelvimetry was performed on 122 women who underwent pelvic computed tomography. Measurements included: the distance between the interobturator foramina line and inferior pubic symphysis (IF-PS distance) as well as pubic arch angle, pubic ramus width, and pubic symphysis length. Results The length of the IF-PS distance varied between 7.4 and 26.9 mm (mean 15.2+4.3 mm, median 14.2 mm). The distribution of measurements was asymmetrical with a tilt of the values towards shorter distances. In 11.5% of women, the IF-PS distance was longer than 20 mm. The IF-PS distance correlated with the pubic ramus width (r=0.37, p<0.0001) and pubic arch angle (r=-0.22, p=0.017). Conclusion The IF-PS distance varies considerably in the general population of women.