Luv my Froggies, luv my Tahos....
so I'm biased.
The amount you have to turn your foot to get out of Frogs is a bit less than you turn over your foot when going around a sharp corner. If turning the corner in your house from hallway to bathroom hurts your knee, be gentle and cautious with the Frogs.
Between my Frogs and my BMX platforms my knee and hip are very content. It's just a matter of finding things that work for you. (Frogs are pretty easygoing in the grand scheme of things.)
"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson