E.F.B. POLYPROPYLENE ANKLE FOOT ORTHOSIS Function To maintain the foot and ankle in a neutral position restricting both plantar flexion and dorsiflexion. Anterior trim lines provide mediolateral stability and some subtalar joint control. Description A polypropylene posterior shell with velcro closure proximally. Often requires adjustment with heat gun at time of fitting. Indications Flaccid drop foot. If very well fitting, can be used on patients with mild tone, although a custom-made A.F.O. is recommended. Also useful in assessing patients for a custom-made A.F.O. Arthritic patients for a custom-made A.F.O. Arthritic conditions requiring immobilization and postoperatively, following ankle fusion.