As Pam said, work with your doc.

I have been through IT band hell (running-related). Thing is, it's not really a knee problem...it's a whole band problem that typically mainfests itself as knee pain. And because it's not your knee, per se, many of the typical "knee" solutions don't apply.

Work with a sports medicine doc. I did this and ended up going through lots of testing. My solution was pedals with as much float as possible and lots of use of the foam roller. I've not had problems with cycling, but I've been a good girl! Go easy and get a good doc!