Lying wall slides are knee rehabilitation exercises to improve flexion - 'facilitated' exercises use the good leg to help gain deeper flexion.
Ask someone to help you to achieve this position, with buttocks close to the wall.
Let the bad leg slide down the wall, passively increasing flexion - and then use the good leg to achieve a few extra degrees and also to help the bad leg up again.
Use a helper
It is a simple exercise, but you may need a helper to help you get your legs into the starting position alongside the wall, perhaps next to a doorway.
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