Prepatellar Bursitis Kneecap Swelling
Swelling in front of the kneecap tends to get a quick label. Before you settle on it, check what the label means and what it leaves out.
Ask what the name prepatellar bursitis covers and what a clinician would need to show for it to hold. Nothing here diagnoses a knee, so treat the one explanation you were given as a question for a second clinician. For wider background, the MedlinePlus page on knee injuries and disorders is a useful comparison.
What the reference says
Wikipedia defines prepatellar bursitis as an inflammation of the prepatellar bursa at the front of the knee. That sentence gives a location and a process. It does not say why a given bursa became inflamed, so the cause is a question for your clinician. Wikipedia is a general reference and not a clinical record, so use it as a vocabulary check.

Read the pain terms beside your own
A definition cannot separate your knee from anyone else's. The MedlinePlus overview of pain offers a second set of terms to hold against your paperwork. Note which word your clinician used for the swelling and what examination it came from.
Questions that expose a hidden assumption
- Which part of the knee was examined, and what did the exam show?
- What cause was proposed for the swelling, and what supports it?
- What else was considered and set aside?
- What would change the plan?
What a second opinion should confirm
Bring a dated note of when the swelling began and what you did about it. Ask the second clinician to confirm the diagnosis and the evidence behind it. Then ask what the first plan does not cover. Look up any term you do not recognize in the WebMD pain management center before the visit.