Knee hyperextension occurs when the joint is forced out of its normal range of motion. This injury can affect one or more of the four major ligaments of the knee, the ACL, PCL, MCL, or LCL. This injury can occur to anyone but is most commonly seen in athletes who participate in contact sports. BioSkin Knee Braces are designed to address the pain and swelling caused by the hyperextension, as well as restore stability to the joint while the ligaments and tendons heal.