I had these injections in my last labour. I was told it's a new thing and one midwife there had seen them work 100% of the time, and the other 50% of the time, they were the two trained to do it. They did this when I was in transition and the back pain was extreme and I'd kind of lost the plot. I do remember them hurting bad (i screamed with one LOL) but really it was minimal compared to the back pain.

In my case they didn't do a thing, but I think that was because of the size and position of my baby and that his shoulder was wedged on my back bone by this time, and maybe because I was in transition anyway. They would be a god send if they did work as was described to me. There are 4 injections, and they do two at a time to lessen the time they are doing them. If I was going back again, I would ask for the injections earlier in the labour to see if they would help.

It's great to see they are trying to develop more natural (well non drug) ways to deal with posterior labours.