title: A new technique for correction of an iatrogenic extension deformity in ankylosing spondylitis.
authors.forename: Barend J
authors.initials: BJ
authors.lastname: Van Royen
mesh_terms: D006801:Humans; D007049:Iatrogenic Disease; D009333:Neck; D010027:Osteotomy / Q000009:adverse effects*; D012086:Reoperation; D013121:Spinal Curvatures / Q000209:etiology* / Q000601:surgery*; D013131:Spine / Q000601:surgery*; D013167:Spondylitis, Ankylosing / Q000601:surgery*; D014794:Visual Fields