Ferrari KAFO is used for example by myelomeningocele children with S1-L4 lesion level. The ankle joint has got a dorsi flexion restriction to 85 degrees, which helps to compensate the knee flexion caused by plantar flexion weakness. The ankles plantar flexion is free. The above knee part can be anterior or posterior. It is used in order to correct knee valgus caused by thigh adductors. An elastic waist belt can be used to combine the legs, if inwards rotation or lower extremity pendulum need to be helped.