A young gentleman by the name of Antoine wrote me a few weeks ago with serious knee pain . I gave him some advice to try and help him out; here's the e-mail I got from him two days ago. Enjoy!
Here is some follow-up after a month or so:
I've been doing the eccentric, single-leg squats on a decline board for a few weeks as you suggested. It doesn't hurt but it is a bit uncomfortable. This being said, I can now do, without any weight, squats and lunges pain free.
I recently tried light deadlifts and front squats (ATG) and it seems to be fine.
So..... this stuff works!
I'll now add some glutes exercises (SLDL, hip abduction, step-up, etc)