I had to get knee surgery because well, they had to get the bone fragments out. But I know how frustrating it is when nothing shows up. I'm going through the same thing with my foot. Thanks for the reminder about tight hip muscles, I know mine are tight yet I totally ignore them and usually wind up dismounting to stretch 20 minutes into the ride. Do you know any good stretches? The one that works for me is where you tilt your pelvis during a lunge. It's the only one that seems to help. But I'm sure tight hip muscles have nothing to do with the foot, especially when I crammed it into a rock. Ouch.