I can't imagine that any brace can prevent a rotating movement by the knee induced by rotating the foot out. The brace is attached only by means of velcro fasteners to flesh and skin. It can certainly prevent some overstretching of the knee, as well as lateral impacts to the side, but rotation - no way.
Try grabbing with your hands above your knee where a brace would sit and try turning your hands around your legs. All tissue on the bone move and flex.
The only way a brace could prevent rotation is if it would be bolted to the bones.
A brace can of course stabilize an already damaged knee.
IMHO
//thomas
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