or this : Sonnon FREE TO MOVE Joint Mobility
and I am sure there are many other, even gentle, ways to reactivate the joint and especially the knees. :-)
I found a trailer of Low's yoga program, doesn't look anything special to me.
If you want a video, maybe this would be helpful: http://www.himalayaninstitute.org/store/product/0586eb3d-8f1a-4778-967f-237b577de509.aspx
Once maybe you worked with this you can move on to the Low program.
But whatever kind of yoga you do, you have to respect the limitations of your body. Every body has limitations, though they might differ. For me yoga is also exploring the limitations and then gently moving beyond the limitations, one 1mm at a time. :-)