Creatine and arthritis

I've been back on creatine for a few weeks for the first time in a couple of years and I've noticed a definite improvement in my knee pain. I can go up and down stairs nearly free of pain now. It's the only change I've made recently in my health and fitness routine. I don't think it's placebo effect because I didn't expect it to do anything for my knee pain. I've been looking online and there are a few studies indicating it might help, but nothing definite. Anybody else notice this?