Hi all - this will be a hard one to explain, but I figure it's worth a shot. I've recently passed the 1-year mark and things are generally good, skiing and all. However, there's been two recent occasions when I've been standing around for an extended period, I guess with the weight primarily on my straight, operated leg. I'll suddenly feel a sharp pain on the front of my right knee, just to the left of the knee cap. I notice it, take the weight off the leg, and the pain goes away within a minute or so. It's happened twice now while standing around, but I don't really have any other pain during normal activity. Anyone experience anything similar or have any idea why this would be happening? I'm probably due for a final OS visit anyways, but thought I'd see if this sounds familiar to anyone. Thanks.