I have been having trouble with one of my knees for quite awhile now. With my new job I have to be on my feet for 8 hours. I do a lot of walking and it sure has been taking a toll on my sore knee. I finally went to the doctor and had xrays taken of it. I had to take off a couple nights of work and am waiting for the results of the xrays. I sure hope it isn't something serious.