title: Factors that influence recurrent lumbar disc herniation.
abstract: BACKGROUND
  The most common cause of poor outcome following lumbar disc surgery is recurrent herniation. Recurrence has been noted in 5% to 15% of patients with surgically treated primary lumbar disc herniation. There have been many studies designed to determine the risk factors for recurrent lumbar disc herniation. In this study, we retrospectively analysed the influence of disc degeneration, endplate changes, surgical technique, and patient's clinical characteristics on recurrent lumbar disc herniation.
  
  
  METHODS
  Patients who underwent primary single-level L4-L5 lumbar discectomy and who were reoperated on for recurrent L4-L5 disc herniation were retrospectively reviewed. All these operations were performed between August 2004 and September 2009 at the Neurosurgery Department of Ataturk Education and Research Hospital in Ankara, Turkey.
  
  
  RESULTS
  During the study period, 126 patients were reviewed, with 101 patients underwent primary single-level L4-L5 lumbar discectomy and 25 patients were reoperated on for recurrent L4-L5 disc herniation. Preoperative higher intervertebral disc height (P<0.001) and higher body mass index (P=0.042) might be risk factors for recurrence. Modic endplate changes were statistically significantly greater in the recurrent group than in the non-recurrent group (P=0.032).
  
  
  CONCLUSIONS
  Our study suggests that patients who had recurrent lumbar disc herniation had preoperative higher disc height and higher body mass index. Modic endplate changes had a higher tendency for recurrence of lumbar disc herniation. Well-planned and well-conducted large-scale prospective cohort studies are needed to confirm this and enable convenient treatment modalities to prevent recurrent disc pathology.
authors.affiliation: Department of Neurosurgery, Memorial Ankara Hospital, Ankara, Turkey.
authors.forename: M E
authors.initials: ME
authors.lastname: Yaman
authors.affiliation: Department of Neurosurgery, Ataturk Education and Research Hospital, Ankara, Turkey.
authors.forename: A
authors.initials: A
authors.lastname: Kazancı
authors.affiliation: Ankara University School of Medicine, Ankara, Turkey.
authors.forename: N D
authors.initials: ND
authors.lastname: Yaman
authors.affiliation: Hacettepe University Graduate School of Health Sciences, Ankara, Turkey.
authors.forename: F
authors.initials: F
authors.lastname: Baş
authors.affiliation: Department of Neurosurgery, Ataturk Education and Research Hospital, Ankara, Turkey.
authors.forename: G
authors.initials: G
authors.lastname: Ayberk
mesh_terms: D000328:Adult; D000368:Aged; D015992:Body Mass Index; D017586:Diskectomy / Q000379:methods*; D005260:Female; D006801:Humans; D055959:Intervertebral Disc Degeneration / Q000601:surgery*; D007405:Intervertebral Disc Displacement / Q000601:surgery*; D008159:Lumbar Vertebrae / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D012008:Recurrence; D012086:Reoperation / Q000706:statistics & numerical data; D012189:Retrospective Studies; D012307:Risk Factors; D014421:Turkey
keywords: Diskectomy; Lumbar vertebrae; Recurrence