The custom CTi2 helps prevent the knee from rotating and hyper extending. You can also get an optional ACL block that prevents translation of the Tibia (resulting in a torn ACL). Mine has saved me many times from re-injuring my reconsructed ACL's. The one piece construction spreads twisting force up into the quadriceps. It is important to adjust the brace to limit hyper-extension. The CTi2 is expensive, but worth the money. Also, learn how to ride without taking your feet off the pegs

It's funny how I've taught myself how to keep my feet on the pegs even when way out of shape and almost crashing. IMHO it improves your balance and makes you a better rider in the long run.