question: a few years ago I had arthroscopic surgery on my right need and a couple months ago as I was running up the stairs to class (I am 23 years old) I felt a pop and a quick sharp pain in the outer part of my knee. Since that incident I have had a constant dull pain and numbness around that side of my knee and some pain around the back of my knee. Could it just be scar tissue, or could it be something more?