, Ligament damage, Meniscus damage or Patello-femoral disorder.
Your symptom of pain over upper portion of knee suggests that it might be due to Patello-femoral syndrome.
When did your pain begin, what were you doing at the time, and what were the initial symptoms?
Do you experience any grinding, locking, catching, or giving way of the knee?
Are there any positions that make your knee more or less comfortable?
What is the quality of your pain (sharp, shooting, dull, etc.)?