question: I have had right knee pain which sometimes goes down into the leg/calf and sometimes goes up the back of my upper leg. About two weeks ago it all fo a sudden hurt with sharp pain right under the front of the knee. I had a hard time putting my weight on it. When I did it hurt pretty bad. Now it just hurts all the time when I am sitting but especially when I get up on it and start walking. What do you think it could be? I am a diabetic and 62 years old.