Bonzie, rather than try to straighten my leg with formal stretches I used an ordinary bed pillow under most of my leg to allow it to bend comfortably while resting/elevating. During the day I would move the pillow under just my heel so the back of the knee was no longer supported for as long as it was only uncomfortable rather than painful. No reps, no sets, just whenever. It got to where I enjoyed stretching out the leg much like stretching during a good yawn. I can work to use muscles but trying to stretch only gets me fighting the stretch as I try to do too much and much too fast. Stretches need to be done at a glacier like speed. I started that as the PT at the hospital warned me my leg would contract and always keep it on a flat surface. Not going to happen, too uncomfortable so this was my compromise.
Sharalder, my right leg was severely valgus too but I couldn't stand it! I couldn't walk any distance at all without my back getting sore and my daughter would jump up to do things for me as she couldn't stand seeing how bad I was walking. Now my left leg is the crooked one! Still an abnormal gait but at least my feet track inside a foot wide path now!