title: Reoperation rate after surgery for lumbar spinal stenosis without spondylolisthesis: a nationwide cohort study.
abstract: BACKGROUND
  Lumbar spinal stenosis is one of the most common degenerative spine diseases. Surgical options are largely divided into decompression only and decompression with arthrodesis. Recent randomized trials showed that surgery was more effective than nonoperative treatment for carefully selected patients with lumbar stenosis. However, some patients require reoperation because of complications, failure of bony fusion, persistent pain, or progressive degenerative changes, such as adjacent segment disease. In a previous population-based study, the 10-year reoperation rate was 17%, and fusion surgery was performed in 10% of patients. Recently, the lumbar fusion surgery rate has doubled, and a substantial portion of the reoperations are associated with a fusion procedure. With the change in surgical trends, the longitudinal surgical outcomes of these trends need to be reevaluated.
  
  
  OBJECTIVE
  To provide the longitudinal reoperation rate after surgery for spinal stenosis and to compare the reoperation rates between decompression and fusion surgeries.
  
  
  METHODS
  Retrospective cohort study using national health insurance data.
  
  
  METHODS
  A cohort of patients who underwent initial surgery for lumbar stenosis without spondylolisthesis in 2003.
  
  
  METHODS
  The primary end point was any type of second lumbar surgery. Cox proportional hazards regression modeling was used to compare the adjusted reoperation rates between decompression and fusion surgeries.
  
  
  METHODS
  A national health insurance database was used to identify a cohort of patients who underwent an initial surgery for lumbar stenosis without spondylolisthesis in 2003; a total of 11,027 patients were selected. Individual patients were followed for at least 5 years through their encrypted unique resident registration number. After adjusting for confounding factors, the reoperation rates for decompression and fusion surgery were compared.
  
  
  RESULTS
  Fusion surgery was performed in 20% of patients. The cumulative reoperation rate was 4.7% at 3 months, 7.2% at 1 year, 9.4% at 2 years, 11.2% at 3 years, 12.5% at 4 years, and 14.2% at 5 years. The adjusted reoperation rate was not different between decompression and fusion surgeries (p=.82). The calculated reoperation rate was expected to be 22.9% at 10 years.
  
  
  CONCLUSIONS
  The reoperation rate was not different between decompression and fusion surgeries. With current surgical trends, the reoperation rate appeared to be higher than in the past, and consideration of this problem is required.
authors.affiliation: Department of Neurosurgery, Seoul National University Hospital, Seoul National University College of Medicine, 101 Daehak-Ro, Jongno-gu, Seoul 110-744, South Korea; Neuroscience Research Institute, Seoul National University Medical Research Center, 103 Daehak-Ro, Jongno-Gu, Seoul 110-744, South Korea; Clinical Research Institute, Seoul National University Hospital, 101 Daehak-Ro, Jongno-Gu, Seoul 110-744, South Korea.
authors.forename: Chi Heon
authors.initials: CH
authors.lastname: Kim
authors.forename: Chun Kee
authors.initials: CK
authors.lastname: Chung
authors.forename: Choon Seon
authors.initials: CS
authors.lastname: Park
authors.forename: Boram
authors.initials: B
authors.lastname: Choi
authors.forename: Seokyung
authors.initials: S
authors.lastname: Hahn
authors.forename: Min Jung
authors.initials: MJ
authors.lastname: Kim
authors.forename: Kun Sei
authors.initials: KS
authors.lastname: Lee
authors.forename: Byung Joo
authors.initials: BJ
authors.lastname: Park
mesh_terms: D000328:Adult; D000368:Aged; D015331:Cohort Studies; D019299:Decompression, Surgical; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008159:Lumbar Vertebrae / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D012086:Reoperation / Q000706:statistics & numerical data*; D013123:Spinal Fusion; D013130:Spinal Stenosis / Q000601:surgery; D013168:Spondylolisthesis; D016896:Treatment Outcome
keywords: Decompression; Fusion; Lumbar spine; Reoperation rate; Surgery