Does it make a pop or does it feel like there is a knot being pulled through a hole that is a little too small? I've had the same sensation after a few long runs and came to the conclusion it was from a breakdown in form as I tired. I felt it most after sitting for awhile then walking up or down stairs. It went away for me and I was back out after a few days, but I'm interested to hear what you find out.
9/13/13 at 8:31am