The authors describe the case of a patient with ankylosing spondylitis who was treated with orthotic devices for postural unleveling. The patient described specific pre-existing postural problems, both static and dynamic, that had been present for many years. A unilateral 9-mm gel heel lift was used, followed by custom-molded orthotic devices that incorporated the heel lift. The patient reported immediate resolution of these symptoms after orthotic treatment, as well as increased functionality and satisfaction in activities of daily living, which coincided with the leveling of his posture. The orthotic devices were used until the patient underwent total hip arthroplasty, at which point the orthotic treatment was discontinued.