This project focuses on developing a rehabilitative functional hinged knee brace designed to support individuals with knee instability due to injuries, surgeries, or conditions like osteoarthritis. By incorporating advanced polycentric hinges that replicate natural knee movement and lightweight materials such as carbon fiber and aluminum, the brace offers enhanced mobility, comfort, and durability. It provides optimal support through adjustable strapping and padding, ensuring a custom fit and even load distribution. Whether for athletes recovering from ligament injuries or the elderly seeking pain relief, this brace aims to improve stability, reduce pain, and promote effective rehabilitation.