A patented hinge design is incorporated into the MaxTrax ROM Air walker providing protected range-of-motion throughout rehabilitation in 7.5° increments from 45° plantar-flexion to 30° dorsi-flexion. The foot and ankle may also be completely immobilized at 0°, 7.5°, 15°, 22.5° and 30° of plantar or dorsi-flexion. A pneumatic liner provides support and compression to help promote fracture healing, while reducing pain and edema following trauma or post-operative procedures.