Step 4: Read and complete the decision guide to learn more about your symptoms.
So far, you've told us you are older than age 45, joints other than your painful knee also bother you and there is swelling in your knee.
Just one more question. It has two parts:
1) Do you have locking of the knee? That is, are there times, even briefly, when you cannot move your knee at all?
2) Are there times when your knee will not support you?