Abstract: An ankle rehabilitation device providing for exercise movement duplicating the complete range of ankle movement including plantar and dorsi flexion, inversion, eversion and rotation. The amount of resistance to movement and the direction of resistance may be changed without disattaching the foot from the device. A tensioning device is also provided to permit use of the device for isometric exercise of the ankle. An ankle rehabilitation device according to one embodiment of the invention comprises a base, a support post mounted to the base, a base plate rotatably mounted to the support post, a foot receiving platform universally mounted on top of the support post, and a two bar linkage mounted at one end to the base plate and at the other end to one of a plurality of attachment points on the foot receiving platform. A coilspring is operatively connected between the bars of the linkage.