The derangement of posture in advanced flexion deformity due to ankylosing spondylitis, as well as operative correction procedures are analysed. The "Dorsal Lordosating Spondylodesis", DLS, according to Zielke is introduced. This method of polysegmental correction and transpedicular fixation via USIS implants allows the recreation of a balanced upright posture by restoration of smooth lumbar lordosis. We present results of 173 patients corrected by DLS. Since the total amount of correction is split into 5-7 osteotomy sites, complication rates are substantially lower than in the monosegmental methods. Besides the gain of body height and immediate pain relief, the restoration of a horizontal axis of vision could be achieved. The latter, for all patients the most important feature, was maintained as up to 5 years follow-up's show.