Well ive had this problem from the dawn of my weightlifting career, Whenever i get to my top set on squats i have a lazy glute (which i beleive was caused from a high school football injury) which makes my knee cave in. This makes my form look like shit, and obviously its not safe going around squatting like that. There's and old video in my profile of this happening. I've tried lots of stuff to help it, like a crap load of single leg work, foam rolling, mobility drills, blah blah...all have helped me, but it never seems to be quite enough. Sometimes it seems to be worse then others. For a while i felt things were going pretty good during the summer, but then i took deload week and when i came back to squatting the next week the problem was MUCH worse. Very frustrating.
Anyways i was influenced by this article http://www.tmuscle.com/free_online_article/sports_body_training_performance/build_bigger_legs_one_at_a_time
which reccomends switching exclusively to a single leg squat movement. I think doing this definately solves the knee cave problem. But im worried it might not be great for hypertrophy of the quads. I will still probably use a leg press as my 2nd quad excersize (no problems with that movment, except gotta be carefull with the back) But im worried the single leg squats would only add mass to my ass as ive done rear elevated squats (only with dumbells) before and felt the insanity in the glutes, less in the quads.
What do you guys think?