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Diagnose my soccer knee injury!!? - soccer knee injuries

I played a football game that evening, and my knee towards the end hit me hard in the tables. There was no explosion or anything, and the pain is really not much, until I left the ground. But now my knee was swollen, especially pain above the kneecap and the interior. It is as if more damage "superficial", but it still hurts to straighten or pressure on my leg. This is not what I think, would feel a ligament injury, maybe I am wrong? "Or maybe something else?

Help me if you have an answer?