Hi Beth
Crunchy knees! It’s very disconcerting. I used to hear it going up the stairs too. Is it happening more often or less often now. You seem to indicate it didn’t happen before yoga. It’s hard to say if you are ‘doing something wrong’ without knowing more about your practice and your body. Maybe you pronate or have flat feet. Do you try to lock your knees and if you do, how do you do that? MANY many times when I have described that locking the knees requires using one’s muscles to create space in the knee joints, people realize that they have been doing it wrong for years (by just locking the joint closed without muscular tensioning of the space).
Namaste
Gabrielle 🙂