knee injury?

[Erin Roepke]

Hello,

I have hyper-extensive knees and also have some kneecap instability because of this, though my kneecaps do not spontaneously dislocate or sublux. Lately though I've noticed after working out or when my legs are very tired/sore my left knee will occasionally give way, the way that your ankles sometimes will for no apparent reason (hopefully someone besides me knows what I mean with that). I don't have pain or swelling, but I do sometimes experience discomfort fully extending my knee. Could this point to some kind of injury?

Thanks