OK, for four days now I've had a stiffness and an odd feeling like something was stuck under the kneecap of my left knee. I've babied it, not doing any exercise. Now, it has been cold, and it rained from Sunday through Thursday, but still, I'm concerned. It feels much like it did in 2010, when my joints went into their death spiral - the difference being there's little or no pain now. I'm wearing new shoes, so its not caused by old wear patterns. I do have flattish feet, and probably need some arch supports, but still....