Most important diameter of pelvis during labour is:: (A) Interspinous diameter of outlet, (B) Oblique diameter of inlet, (C) AP diameter of outlet, (D) Intertubercular diameter
Answer is A. 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).