Abstract: A range of motion (ROM) removeable cast walker (RCW) has an ankle hinge that may be locked and unlocked by the user. A first sensor is responsive to the locked/unlocked condition of the RCW. A second sensor is responsive to the presence of a limb within the RCW. A third sensor is responsive to weight borne by the RCW. If the ankle hinge is unlocked, the ROM RCW is being worn and weight is being borne, a warning is provided to the patient to remind the patient to lock the ankle hinge to conform to the therapeutic regimen. A radio transmitter may report the state of the ROM RCW to a smart phone and to a remote storage facility for use by a physician.