Lump near Patella

Patient

Q: I have a hard lump behind my left patella, which occasionally pops out to the right side of my knee cap. It only hurts when the lump pops out, but when I push it back "under" my knee cap, the pain in gone. My knee will also lock when the lump has popped out to the side. Nothing is showing up in x rays, which rules out loose fragments. What could this lump be?

Doctor

A:   This question is currently in queue and will be answered shortly by one of our doctors. In the meantime you may browse our library of answered questions by clicking here.

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