Diagonal conjugateis defined as the distance between :
· The diagonal conjugate is clinically estimated by measuring the distance from the sacral promontory to the lower margin of the symphysis pubis
Upper border of symphysis pubis and the sacral promontory
Lower border of symphysis pubis and the sacral promontory
Lower border of symphysis pubis and the third piece of sacrum
Lower border of symphysis pubis and tip of sacrum