Twenty years of experience in the treatment of paralytic drop-foot by means of the physiological tendon transplantation, combined with stabilization of the ankle, have convinced the author of the efficacy of this method in the correction of this type of paralytic deformity. The actual examination of the tendons at secondary operations, as well as by clinical tests, shows that transplanted tendons can function with almost the same strength and freedom of motion as normal tendons, provided that the physiological method of transplantation is followed.