This older thread might be of some help to you http://www.snowboardingforum.com/sla...ated-disc.html
This season I'm completely fine disc-wise. But I'm still a little spooked by tweaking it again..that pain is excruciating.
Like Efilnikufesin said, stretch your hip flexors, the psoas group of muscles. A lunge stretch really helps and is easy enough to do on-hill when needed and before riding.