Hello, I am 3 weeks post sit. My surgeon said that if you get the extension to 0 first, the flexion will follow. He does not want me to sleep with my knee bent. Sit on a firm chair, put a pillow under your foot and prop it onto a coffee table. Do not support your knee . Watch a short tv program in this position. You can apply an ice pack to your knee while you are doing this. The weight of the ice will push down on your leg, and help increase the extension. When laying down, keep your leg straight and have your toes pointed upward. I put pillows on both sides of my foot to hold it in position. When elevating your leg put the pillow behind your ankle and calf. Do not put the pillow under your knee. All of these things I do and have an extension of 0 since week 1. I hope it helps you also. Best wishes!