|: Are they really helpful for twisting injuries?
I think they might help warm up the knee area when it is hot outside. This might in turn help loosen the knee for flexibility, which might slightly help the body flex; thereby helping to prevent injuries.
But, if you really twist your knee, I think it all boils down to "How far can your knee twist?".
I've taken to tightening my knee pads (especially the bottom strap) to prevent my pads from slipping off on impact. I sweat a lot!