I am very sorry about the difficulty you are having with your hips. My mother had a bad hip for one reason or another and was walking awkwardly and painfully for years before she finally got hip-replacement surgery (artificial hip). I hope it doesn't get that bad and that you make a good recovery.
Originally Posted by Grizzly
Any pointers for rolling that does not cause strain on hips?
The first thing that comes to mind is the deep water storm roll.
It is the easiest roll to do, and requires no hip-snap. Unfortunately this doesn't do you a lot of good on the mankier whitewater, and I can't honestly comment on how it does on any river. I've only messed around with it in calm deep waters, never in combat. Takes a lot of set up time. It's sort of a last-ditch effort swimmings-not-an-option-style sea-kayaking roll.
Outside of that, for when you do need to hipsnap, you will probably want a boat that's easier to roll; requiring less power in your hip-snap. This probably shouldn't be a consideration for typical paddlers, but it's what the doctor ordered. Creek boats are generally considered easier to roll. On top of that, some creek boats are easier to roll than others. Whatever the case is, you may want to demo with ease-of-roll in mind, given your unique predicament. This is just me, but I found the prijon pure incredibly easy to hand roll. With my playboat, I can really only count on one or two hand rolls for the day, excluding rodeo rolls (and that's not in combat). In the pure (creeker), I feel that I could do them all day.
Another roll that should be easier on your hips is the pawlata roll. It's just a sweep roll with extra long set -up time and is basically just a bigger sweep roll. Does require a hip-snap still, though.
On top of that, you may want to get a paddle with more purchase/surface area. Using my own gear for reference again, Anderson Paddles
and other custom wood paddle makers could probably assist you better than the typical factory-paddles.
To top it all off, there's "bad" technique that might work to your advantage, and that's a "shoulder roll". That's where you basically use more shoulder than hip; it tends to occur naturally when your hips wear out. You could do a sculling brace to work your way up, and this type of roll will probably wear you out quickly, but it delegates a lot of the effort away from your hip.
Just my two cents of brainstorming. Good luck!