The motion of the orthosis' ankle joint to dorsi flexion is restricted to 3-7 degrees. The plantar flexion movement is practically about 10 degrees. The foot and below knee parts overlap each other behind ankle thus creting a dorsi flexion stop. With this structure can a tendency of knee flexing be helped without locking the knees with patients that have weak plantar flexors. The orthosis is most commonly used with MMC children of S1-S2 lesion level. With young children the structure of the foot part can be very closed which enables a proper correction and prevention of foot malalignments.