Acl knee brace should i wear one to prevent twisting?

Not really: An acl brace has not been shown to prevent any rotation in the knee. It really only prevents stress on the mcl or lcl ligaments. A patient without an acl can still injury the meniscus and cartilage while wearing a brace. Furthermore, many braces inhibit the quad muscles, further worsening some symptoms.

Wont stop it !: Braces have not been shown to decrease the risk of tearing your acl. They do provide reassurance, but the brace itself will not stop an injury. If desired, you may wear any brace that is comfortable.