If you want girly contours down below, pay the twelve or fifteen thousand bucks for the Brazilian butt lift fat transfer surgery and call it done. If you do it that way, you will not only get the appearance of wider hips, you will also get a better, more feminine looking butt, and a smaller waist out of the deal. The only bad part of the whole deal other than the cost, is not being able to sit down or sleep on your back for the next six to eight weeks while you heal.
But intentionally breaking your hip? The risks involved are insane. Even those Russian and Chinese doctors who make you taller won't touch that kind of surgery, and for good reason.