Oh, please don't jump to that conclusion!! The knee joint is one of the most troublesome in the human body! I'm sure it's more of an anatomical/injury type problem! Did they xray your knee before? Most likely you have a ligament issue. Think positive and try not to focus on your worst fear, though I understand completely. If you had bone cancer, your symptoms would be much more far rainging than just pain in a single joint. But of course, I'll be keeping you in my prayers. I'm sure you'll feel much relieved after visiting the dr. Let us know how the visit goes. {{{HUGS}}} Sandra