A foot structure and function assessment device and a method of using the device are provided. The device includes a base having a top surface for supporting a patient's foot, a clamp attached to the base for immobilizing a second metatarsal of the foot, a vertical measurement mechanism carried by the base for measuring displacement of a first ray of the foot, an actuation member for vertically displacing the first ray, and a controller configured to displace the first ray by applying a first vertical load to the first ray using the actuation member, wherein the first vertical load is associated with a first ray position of the foot, and to displace the first ray by applying a second vertical load to the first ray using the actuation member, wherein the second vertical load is associated with a first ray mobility of the foot.