Pelvis Types of pelvis The gynecoid type(女型骨盆) round slightly ovoid or elliptical inlet. adequate sacrosciatic notch. wide interspinous diameters(210cm).52%-589% The platypelloid type(扁平型骨盆) distinct oval inlet. very wide subpubic arch 23.2%-29%Pelvis ▪ Types of pelvis 1. The gynecoid type (女型骨盆) round, slightly ovoid or elliptical inlet. adequate sacrosciatic notch. wide interspinous diameters(≥10cm). 52%-58.9% 2. The platypelloid type (扁平型骨盆) distinct oval inlet. very wide subpubic arch. 23.2%-29%