Just in case anyone cares, I've recovered from my klonk enough to go on rides. It still is stiff in the mornings after a ride, but I can now do decent rides without pain. I did 65 k yesterday. From what I can see it's an inflammation of the quadricep tendon, probably from the trauma of the klonk. I was going to have it checked out but figure they aren't going to tell me to do anything but what I'm already doing. It's just one of those things that takes a while to entirely go away. In the meantime I actually do have a real pedal klonk on my calf. Boy, it's great to be back on the bike! What with watching the Tour and going on rides, my entire life is about cycling. It's great!