Patellofemoral syndrome is pain experienced around the kneecap and which may be caused by a combination of several possible factors.
A syndrome is a collection of related symptoms. In patellofemoral syndrome the pain is felt in the region of the kneecap, but the root cause may be elsewhere, causing an imbalance of forces that affect kneecap tracking - it is important that the clinician tries to identify what is causing the pain. A common cause is knock knees (dynamic valgus) with flat feet.
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Patellofemoral pain in athletes. Petersen W, Rembitzki I and Liebau C. Open Access J Sports Med. 2017; 8: 143–154.