I think that would be more of a rack pull, but since you're the one repping over 500 lbs we'll call it whatever you like!
Piggybacking with a recent somewhat inspiring fitness story: I started doing Stronglifts 5x5 in mid-August (look it up if you're curious about the barbell movements, as it's a great beginner program). Squatting around 170 for reps right now. Not a lot, but good start. I also have serious femoral vein damage in my left leg from a series of very many blood clots. Previously in pain, all the time, no matter what with limited mobility. Also tweaking my right knee constantly from favoring the other leg. After starting to squat "heavy" for a few weeks now? No pain. Zero. Zilch. Mobility's back. Fishing is awesome when you're not limping.
A-Jay's right. Give weightlifting a try.
Disclaimer: I am not a doctor (of medicine, anyway). Please seek medical advice before starting any serious exercise program. Don't blow out your knees, hips, or other body parts because some guy on the internet (me!) claims that squatting will cure what ails ya.