title: Effect of postoperative lumbar sagittal alignment on the development of adjacent instability.
abstract: OBJECTIVE
  This study investigated the effect of postoperative lumbar sagittal alignment on the development of adjacent segment instability.
  
  
  METHODS
  The patients were retrospectively divided into two groups (hypolordotic and hyperlordotic) using the lumbar lordosis on lateral lumbosacral view. Diagnosis of adjacent segment instability depended on the dynamic lateral views of the lumbosacral spine.
  
  
  RESULTS
  Thirteen (21.7%) cases developed adjacent segment instability during the 6-year follow-up. The two groups had no significant difference in rates of developing adjacent segment instability.
  
  
  CONCLUSIONS
  Restoring the lordosis of the lumbar curve during one motion segment fusion does not prevent the development of adjacent instability.
authors.affiliation: Department of Orthopaedic Surgery, Chang Gung Memorial Hospital, Taoyuan, Taiwan. hardbone@yahoo.com
authors.forename: Po-Liang
authors.initials: PL
authors.lastname: Lai
authors.forename: Lih-Huei
authors.initials: LH
authors.lastname: Chen
authors.forename: Chi-Chien
authors.initials: CC
authors.lastname: Niu
authors.forename: Wen-Jer
authors.initials: WJ
authors.lastname: Chen
mesh_terms: D000368:Aged; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D016268:Internal Fixators / Q000009:adverse effects; D007405:Intervertebral Disc Displacement / Q000601:surgery; D007738:Kyphosis / Q000209:etiology / Q000503:physiopathology / Q000517:prevention & control; D008159:Lumbar Vertebrae / Q000473:pathology / Q000503:physiopathology* / Q000601:surgery; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000209:etiology* / Q000503:physiopathology / Q000517:prevention & control; D012189:Retrospective Studies; D013123:Spinal Fusion / Q000009:adverse effects*; D013131:Spine / Q000473:pathology* / Q000503:physiopathology* / Q000601:surgery; D013168:Spondylolisthesis / Q000601:surgery; D013169:Spondylolysis / Q000209:etiology* / Q000503:physiopathology / Q000517:prevention & control