A lower limb orthotic device adapted to be worn by a user comprising: a thigh link adapted to couple to a user's lower limb; a hip link; a hip joint rotatably coupling the thigh link and the hip link to allow flexion and extension between the thigh link and the hip link through a range of motion; an electric motor; a power source that provides electric power to the electric motor; a hip torque generator interconnected between the thigh link and the hip link, the hip torque generator including: a hip actuator; and a mechanical transmission mechanism connected to the hip actuator, wherein the mechanical transmission mechanism includes a multi-bar linkage having at least first, second and third pivoting links (121, 122, 123), with the hip actuator and the mechanical transmission mechanism being interposed between the thigh link and the hip link, wherein one end of the hip actuator is pivotally connected to the hip link and the other end of the hip actuator is pivotally connected to the first pivoting link; a fluid circuit fluidly connected to the hip actuator; and a hydraulic pump adapted to develop a flow of hydraulic fluid in the fluid circuit; wherein the electric motor, the hydraulic pump and at least part of the fluid circuit are placed behind a user's back when the device is worn by a user; and the electric motor is for applying torque to the pump from a position behind a user's body when the device is worn by a user, wherein the pump is in direct communication with the fluid circuit such that torque applied to the hip joint is regulated by controlling a torque applied to the pump through the electric motor. a thigh link adapted to couple to a user's lower limb; a hip link; a hip joint rotatably coupling the thigh link and the hip link to allow flexion and extension between the thigh link and the hip link through a range of motion; an electric motor; a power source that provides electric power to the electric motor; a hip torque generator interconnected between the thigh link and the hip link, the hip torque generator including: a hip actuator; and a mechanical transmission mechanism connected to the hip actuator, wherein the mechanical transmission mechanism includes a multi-bar linkage having at least first, second and third pivoting links (121, 122, 123), with the hip actuator and the mechanical transmission mechanism being interposed between the thigh link and the hip link, wherein one end of the hip actuator is pivotally connected to the hip link and the other end of the hip actuator is pivotally connected to the first pivoting link; a hip actuator; and a mechanical transmission mechanism connected to the hip actuator, wherein the mechanical transmission mechanism includes a multi-bar linkage having at least first, second and third pivoting links (121, 122, 123), with the hip actuator and the mechanical transmission mechanism being interposed between the thigh link and the hip link, wherein one end of the hip actuator is pivotally connected to the hip link and the other end of the hip actuator is pivotally connected to the first pivoting link; a fluid circuit fluidly connected to the hip actuator; and a hydraulic pump adapted to develop a flow of hydraulic fluid in the fluid circuit; wherein the electric motor, the hydraulic pump and at least part of the fluid circuit are placed behind a user's back when the device is worn by a user; and the electric motor is for applying torque to the pump from a position behind a user's body when the device is worn by a user, wherein the pump is in direct communication with the fluid circuit such that torque applied to the hip joint is regulated by controlling a torque applied to the pump through the electric motor.