Orthopaedic apparatus for walking and rehabilitating a motion-injured person, with an exoskeleton to support the patient's body, comprising: - first, second and third articulated rods (1, 2, 3) set along the patient's trunk, thighs and lower legs respectively and connected by pins (4, 5) opposite the hip and knee joints, - a pair of plates set externally along one and the other knee joint, respectively, - first and second actuators (7, 8) anchored by hinges (9, 10, 11, 12) to said plates and said articulated rods (1, 3), respectively, capable of imparting motions on said rods corresponding to those of a human gait, - an electronic control unit connected to said actuators to control their operation, so as to impart said motions to said articulated rods, - a remote control for actuating said control unit by the patient, providing the possibility of sending, to said control unit, in addition to perambulating commands, also commands allowing the patient to assume an upright or a seated position, - a bodice fitted to the patient's trunk, of a partially rigid structure, capable of rigidly connecting the first articulated rods, - means capable of clasping and rigidly fastening the first articulated rods flanking the patient's trunk to the sides of the bodice, at the time the bodice is put on by the patient, - the hinges (10, 11) present on each of said plates are flanked at the two sides of said second articulated rods, characterized in that: - each of said plates is firmly attached to the one and the other of said second articulated rods set along the patient's thighs, at a point of the rod destined to align itself with the patient's knee, - the hinges anchoring said second actuators to the third articulated rods are positioned at a point of the rod destined to be flanked at the side of the patient's ankle, - said actuators are of a mechanical cylinder type, fitted internally with an electric motor, an epicycloidal reducer, and a recirculating ball screw for a linear actuation of the cylinder pushing/pulling rod or tube, - said electronic control unit is programmed so as to command, upon receipt of a signal to move from a seated to an upright position, a progressive extension of only said first and second actuators' pushing/pulling tubes, until the articulated rods have reached an aligned position, and vice-versa to command, upon receipt of a signal to move from an upright to a seated position, the progressive re-entry of only said first and second actuators' pushing/pulling tubes, until every contiguous pair of the articulated rods has assumed a relative angular position of about 90°. - first, second and third articulated rods (1, 2, 3) set along the patient's trunk, thighs and lower legs respectively and connected by pins (4, 5) opposite the hip and knee joints, - a pair of plates set externally along one and the other knee joint, respectively, - first and second actuators (7, 8) anchored by hinges (9, 10, 11, 12) to said plates and said articulated rods (1, 3), respectively, capable of imparting motions on said rods corresponding to those of a human gait, - an electronic control unit connected to said actuators to control their operation, so as to impart said motions to said articulated rods, - a remote control for actuating said control unit by the patient, providing the possibility of sending, to said control unit, in addition to perambulating commands, also commands allowing the patient to assume an upright or a seated position, - a bodice fitted to the patient's trunk, of a partially rigid structure, capable of rigidly connecting the first articulated rods, - means capable of clasping and rigidly fastening the first articulated rods flanking the patient's trunk to the sides of the bodice, at the time the bodice is put on by the patient, - the hinges (10, 11) present on each of said plates are flanked at the two sides of said second articulated rods, - each of said plates is firmly attached to the one and the other of said second articulated rods set along the patient's thighs, at a point of the rod destined to align itself with the patient's knee, - the hinges anchoring said second actuators to the third articulated rods are positioned at a point of the rod destined to be flanked at the side of the patient's ankle, - said actuators are of a mechanical cylinder type, fitted internally with an electric motor, an epicycloidal reducer, and a recirculating ball screw for a linear actuation of the cylinder pushing/pulling rod or tube, - said electronic control unit is programmed so as to command, upon receipt of a signal to move from a seated to an upright position, a progressive extension of only said first and second actuators' pushing/pulling tubes, until the articulated rods have reached an aligned position, and vice-versa to command, upon receipt of a signal to move from an upright to a seated position, the progressive re-entry of only said first and second actuators' pushing/pulling tubes, until every contiguous pair of the articulated rods has assumed a relative angular position of about 90°.