ehirsh - sounds like you had a "joint derangement" which yoga cleared up for you! Hooray! If it comes back, don't despair. Do the yoga move that fixed you again (and if you can, do it every couple hours until you've been pain-free for a week and you can assume the boo-boo has healed completely) or find a McKenzie-trained physical therapist who can help you refine the motion that reduces your derangement.
I love it when this stuff happens!
"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson