ditch the buckwheat?
And just when I'm in the market for my very own cushion I read a comment that says stay away from buckwheat. I've been sitting on rolled up pillows and whatnot and was going to buy something better, but thought I'd ask advice before plunking down the money. What SHOULD I be looking for? Round? Square? 8 inches tall? 12?
For some perspective, I'm in my 40s, fairly fit, with short legs and I'm relatively flexible, with one caveat - a bad knee. I bunged it up four years ago (running windsprints of all things) and it pretty much aches all the time. I can sit in half-Lotus, quarter Lotus, whatever you call it when one leg is on the floor and the other's on top of the other leg or calf. When I first sit down, the pain in the knee is pretty bad, but it gets less over time, or goes numb more likely. Right now, though, I absolutely cannot walk when I get up from sitting, usually a half hour or so. I read accounts of people "jumping up" after sitting to run talk to their teacher or whatever and it just floors me that anyone could even contemplate any motion at all other than a long agonizing stretch before hobbling along.
All that said, is there something I should be looking for in a zafu to help make my sitting more comfortable?