I have an Innovation Sports EDGE, which is an "off the shelf" version of the CTi. I'm lucky as it fits perfect and has served me well for years now. There is no doubt it limits some twisting. Enough to prevent injury? Hard to say, but it helps. Also, there is somewhat of a psychological advantage to wearing a brace on a questionable knee. I was skiing this week and forgot to pack mine, and I definately thought about my knee more which slowed me down a bit.
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