title: Revision surgery of the lumbar spine: anterior lumbar interbody fusion followed by percutaneous pedicle screw fixation.
abstract: OBJECTIVE
  The aim of this study was to evaluate the efficacy of anterior lumbar interbody fusion (ALIF) augmented by percutaneous pedicle screw fixation (PSF) for revision surgery in the lumbar spine and to determine the prognostic factors affecting surgical outcomes.
  
  
  METHODS
  The population included 54 consecutively treated patients in whom revision surgery involving ALIF with PSF was performed between 2001 and 2004. There were 22 men and 32 women, whose mean age was 59.5 years (range 25-78 years). The diagnoses prior to revision ALIF were as follows: degenerative disc disease in 25 patients, instability/spondylolisthesis in 15, recurrent disc herniation in seven, and pseudarthrosis in seven. The mean follow-up period was 24 months (range 12-52 months). The mean visual analog scale score for back and leg pain decreased, respectively, from 7.8 to 2.3 and 8.0 to 2.3 (p < 0.001). The mean Oswestry Disability Index score improved from 70 to 25% (p < 0.001). Radiological evidence of fusion was noted in 52 of 54 patients. The mean preoperative segmental lordosis, whole lumbar lordosis, and sacral tilt were 15.2, 35.5, and 28.3 degrees, respectively; these values were significantly increased to 20.4, 40.7, and 31.4degrees, respectively, after revision surgery (p < 0.001). The increase in sacral tilt was positively correlated with improvement in back pain (p = 0.028) and functional status (p = 0.025).
  
  
  CONCLUSIONS
  The results demonstrate that ALIF followed by PSF can be an effective alternative in revision surgery of the lumbosacral spine in selected cases. Not only can solid fusion be achieved, sagittal alignment can also be restored in the majority of patients.
authors.affiliation: Department of Neurosurgery, Wooridul Spine Hospital, Seoul, Korea.
authors.forename: Sang-Ho
authors.initials: SH
authors.lastname: Lee
authors.forename: Byung-Uk
authors.initials: BU
authors.lastname: Kang
authors.forename: Sang Hyeop
authors.initials: SH
authors.lastname: Jeon
authors.forename: Jong Dae
authors.initials: JD
authors.lastname: Park
authors.forename: Dae Hyeon
authors.initials: DH
authors.lastname: Maeng
authors.forename: Young-Geun
authors.initials: YG
authors.lastname: Choi
authors.forename: Won-Chul
authors.initials: WC
authors.lastname: Choi
mesh_terms: D000328:Adult; D000368:Aged; D001863:Bone Screws; D005260:Female; D005500:Follow-Up Studies; D005592:Fracture Fixation; D006801:Humans; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D011859:Radiography; D012086:Reoperation; D012189:Retrospective Studies; D013122:Spinal Diseases / Q000000981:diagnostic imaging / Q000601:surgery*; D013123:Spinal Fusion; D016896:Treatment Outcome