Unstable pelvic fracture
In our region in NY the MAST pants are still protocol, unless contraindicated.
A couple of years ago we had a woman who was standing upright in a roadside ditch, pinned by a fully loaded dumptruck that had lost it's brakes and came back down the hill, into the ditch where she was. While the truck had her pinned, she was alive and talking to the road crew and our EMTs. Once the truck was pulled off her, she collapsed and essentially bled out.
We worked her all the way to the hospital (25 minutes or so). Once in the ER, they took over (I stayed at her head and bagged - got to see a lot from that angle). One of the docs called for the MAST pants, which I thought was pretty interesting, since the most recent scuttle on them was that they were fast falling out of favor everywhere. In fact, I had heard that some squads had removed them completely from their rigs. It was one of those moments when you say to yourself "should I have considered doing that"?
As it turned out, they couldn't get her into the MAST pants due to the massive degloving of her buttocks and right leg - couldn't get the skin and muscle back up where it needed to be for the pants to fit and be inflated. Due to the long down-time, I was surprised that the ER docs weren't just going to call it a day after a short effort. They worked her for about 45 minutes, I think.
Anyway, what she had was more than just an unstable pelvic fx, but I'm always interested to hear on whom and under what circumstances the MAST pants are used.