From experience asterisks are about the worst braces to buy. I hyper extended my knee in 06 causing quite a bit of damage, after that I bought a set thinking that would save me. Well several years later I did the same thing causing the same damages and having to have the same surgery. My orthopedic surgeon demonstrated why asterisks don't do the job. They brake at the hinge with just his hands flexing then backwards. He recommended cti2's. quite pricey but insurance usually covers them and I have yet to have another knee injury!