Tomorrow I see the doc to get a referral. Did 64 in the heat and humidity on Sunday. It didn't bother me until mile 44. If I push on the front of the knee I feel a little click and the pain stops, and as long as I am mindful of the pedal stroke it does not come back. As soon as I push too early, it roars back to life. Maybe the doc will find a tendon issue or something similar. Still riding, just being careful how the pedal stroke is done.