A New Kind Of Pain

I have been experiencing a new sensation in my knee the past couple of weeks. Most of the pain that I feel from day to day involves what I consider to be a dull pain. It feels sort of stiff, thick, and generally "sore", like a week-old injury that lingers past the initial severe pain. Now, however, I've been feeling more of what I would describe as a sharp pain. It feels as though something inside is jabbing at me, like a small knife. Bone maybe? Who knows. The thing is that I know if this feeling will go away soon enough, or if I'll just grow accustomed to it and learn to ignore it like everything else. I think that I feel it so distinctly now because it's new and my mind hasn't adjusted enough to simply disregard it. I've had varying pains over the years, both in the type of sensation and the level of severity. Some of it has lingered, and some if it has gone away completely. I believe that this one seems so distinct because it's a sharp pain, sort o...