If you are having tendon weakness, then it could be patellar sub-luxation or patellar dislocation.
<span style = 'background-color: #dae8f4'>when</span>
did your <span style = 'background-color: #dae8f4'>pain</span>
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.)?
Have you tried anything to help the pain
and, if yes, has that been successful?