Barre workouts really target the quads (plies) and glutes (foldover/pretzel) and move at a slow enough pace that I think they'd be therapeutic for the knees. My favorite barre is Ballet Body by Leah Sarago. She has lots of downloads that you could buy that target the glutes (Pretzel 1 and 2, Diagonal Foldover, Variations in Foldover, Bridge at the Wall, Ballet Body Step) and quads (any of her plie segments).
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