I was squatting 360 for reps a few months ago; was having some knee pains in my right knee so I took a few weeks off. Pain never subsided, so I went to my gf's work (she works for a physical therapist) and it turns out I'm a freak. Apparently, when I stand feet forward and lock my knees, my knee caps actually float a little bit instead of sitting in the sockets. To make matters worse, everything under my knee actually bows to the outside slightly instead of lining up directly under my knees. So the therapist gave me some knee cap stretches, and I had to change my squat form (more flare on my feet to line up my knees) but I still can't go past parallel.