Most important diameter of pelvis during labour is:
Ans. is a, i.e. Interspinous diameter of the outletRef. Williams Obs. 24/e, p 33; Dutta Obs. 9/e, p 82Interspinous diameter is the distance between the two ischial spines and is the smallest diameter of the pelvis = 10 cm or slightly greater. It corresponds to the transverse diameter of midpelvis (i.e. plane of least pelvis dimensions).
Interspinous diameter of outlet
Oblique diameter of inlet
AP diameter of outlet
Intertubercular diameter
Fetal Skull and Maternal Pelvis