Last week I saw an obstetic physio for SPD. I was told that I should avoid being on my back during labour as there was a strong risk of further trashing my ligaments. I have been advised to give birth in a supported kneeling position. (Which is fine by me as I used that position successfully with my son.)
I was also given a leaflet on birth positions and it says there is a greater risk of incontinence problems after birth if you give birth on your back.
The most common reason for people not giving birth on their back is that it is working against gravity and slows down birth. (Ie. the active birth arguements.)
So with all these really strong arguements against labouring on your back, why do hospitals put so much pressure for women to give birth on their backs?