[The Professor]

I'd also suggest that if you go back to doing squats, you think about starting with box squats at or below parallel. This will help you think about form a little differently and put the focus on your hams, taking it off your quads and knees. I don't have the greatest knees in the world; but squatting never hurts them because I'm slow, deliberate, and focusing everything I can on my posterior chain rather than my quads and knees. YMMV, but that's what I would do.

Good luck recovering.