Hi Mike,
I have been involved with Jay Schroeder’s ISO positions, who showed them to me in person - but you can get information about them here:
http://evosport.wordpress.com/
(note: There is really a lot of discussion and controversy about this stuff around the internet, I don’t want to get into too much debating here… But they have worked for me. )
"In my iso extremes one is pulling into position the complete time of performance. It is not a resisting of the load. The seven positions are:
iso extreme preacher curl
iso extreme pushup
iso extreme scapular pullup
iso extreme front lunge
iso extreme 1 legged squat
iso extreme glute ham
iso extreme supported squat
One pulls into the extreme position and then continues to pull throughout the total time." (5minutes).
I haven’t been doing exactly those exercises, but I am assuming that the supported squat helped me the most with my knee. When I have knee irritation, I drop the lunge all together.
With knees, it’s important to do anything right, so you don’t add more stress to them.