A rupture is a hernia. Usually it's referring to an inguinal hernia, which is where a bit of intestine pushes down through groin muscles and into a man's 'dangly bits.' As far as I know, they're usually caused by heavy lifting. That kind of hernia won't heal on its own. You either get surgery or just live with it.

I really dunno what trusses did for that aside from maybe keeping the 'boys' from moving around and causing a lot of discomfort.