Persistent Knee Swelling

Okay. The reason for this question is that a form of bursitis (called pre-patellar bursitis) can cause knee pain and swelling yet the problem isn't in the joint at all. Since you don't have swelling there, it's less likely that you have that type of problem.

Do you have pain and/or swelling that is worse after walking or that is most prominent at night or at the end of the day?

Yes, it's worse after walking, at night or late in the day.

No, it's not worse after walking or toward the end of the day.