Abstract: The present invention relates to an apparatus comprising: a seat for a patient; a support platform for the feet of the patient, positioned anteriorly to the seat; an alignment system allowing a patient's leg and its corresponding foot to be aligned in the three space planes in order to determine the tibia correct verticality; a system for properly positioning the foot on the platform including at least turrets able to allow pads to be applied in contact with the talus and/or scaphoid inside the foot and in contact with the calcaneus and/or cuboid outside the foot; a foot measurement system in a neutral position; an automatic real time driving system for properly positioning the leg and foot with numerical indication and direction of the movements to be carried out; a central unit capable for receiving and processing the data detected by the measurement system for footprint digitalization.