A polypropen KAFO with a below knee part that functions like a peroneal brace. It is intended for patients that have not got enough muscle strength to stretch the knee. The form of the thigh section helps to correct the possible instability of the pelvis caused by muscle weakness. The knee joint has got a lock. The firm structure of the cuffs enable the slender structure of the brace. The cuffs are padded and the fastening is made of velcro.