Knee friendly quad stretch?

[Catrin]

The subject says it all, my knee is behaving itself for the most part, and I am cleared to ride and to go to spinning class - but my usual quad stretch does cause discomfort in the knee right now. Is there a way that I can stretch my quads without really having to bend the knee back so far? My assumption is that there isn't, but you never know unless you ask

I did find something called quadricep isometric exercise - but that looks to be something else. My chondromalacia is quite minor, but since the normal quad stretch (where you grab your foot and draw up your leg behind you) does cause discomfort right now it doesn't seem wise - but I need to find someway to stretch that muscle group. Of course I will keep searching the internet, but thought someone here might have experience with something that would work.