I woke up yesterday and for the first half of the day whenever I put pressure on the ball of the foot behind my big toe, I would get a sharp, stabbing sensation in the inside of my upper tibia. I could barely walk without a limp. This pressure occured even when not walking but putting pressure under it with my hand. The pressure suddenly went away later in the day after a loud pop, and I haven't felt it at all today. Any ideas what this was? Should I worry about it? Should I run today or take it off to play it safe? Thanks