^^ Well I definitely have strong quads. Particularly VMO's too, thanks to ATG squats. Aren't the VMO's are activated mostly at near full flexion and near full extension of the knees?
Now that I think about it, when I was a one legged jumper, I went through a period of one or two years where whenever I would drive hard to the basket, my knees would collapse as well! Back then I was only squatting to parallel. There could be some connection here.