title: Analysis of operative complications in a series of 471 anterior lumbar interbody fusion procedures.
abstract: METHODS
  This retrospective review compares the intraoperative and perioperative complications associated with the placement of threaded devices and nonthreaded devices used in anterior lumbar interbody fusions.
  
  
  OBJECTIVE
  Anterior lumbar interbody fusion is a common procedure performed with either a nonthreaded device, such as a femoral ring, or a threaded device, such as with a cage or a bone dowel.
  
  
  BACKGROUND
  Many studies have been done detailing the fusion rates and biomechanical properties of both devices. However, few studies have been performed evaluating acute complications between the two device types.
  
  
  METHODS
  A retrospective chart review was performed of 471 consecutive patients who underwent anterior lumbar interbody fusion: 243 with a nonthreaded interbody device and 228 with a threaded interbody device. Operative notes, anesthesia reports, discharge summaries, and follow-up notes were reviewed from 1992 to June 2002. The patients' demographics, diagnosis, number of levels fused, type of device used, length of hospital stay, and acute complications, either intraoperative or perioperative, were collected and analyzed.
  
  
  RESULTS
  Approximately 4.8% of patients with a threaded type interbody device had an intraoperative complication whereas only 0.4% of patients with a nonthreaded type device had an intraoperative complication. There was a significant association between interbody device type (threaded vs. nonthreaded) and occurrence of an intraoperative complication (P = 0.0024).
  
  
  CONCLUSIONS
  Placement of threaded devices, such as cages or bone dowels, was associated with a higher acute complication rate than was the placement of nonthreaded devices during anterior lumbar interbody fusion.
authors.affiliation: Indiana Spine Group, Indiana University School of Medicine, USA. rsasso@on-net.net
authors.forename: Rick C
authors.initials: RC
authors.lastname: Sasso
authors.forename: Natalie M
authors.initials: NM
authors.lastname: Best
authors.forename: Praveen V
authors.initials: PV
authors.lastname: Mummaneni
authors.forename: Thomas M
authors.initials: TM
authors.lastname: Reilly
authors.forename: Sajjad M
authors.initials: SM
authors.lastname: Hussain
mesh_terms: D000293:Adolescent; D000328:Adult; D016063:Blood Loss, Surgical; D001860:Bone Plates; D005260:Female; D006801:Humans; D016268:Internal Fixators; D007405:Intervertebral Disc Displacement / Q000601:surgery; D008159:Lumbar Vertebrae / Q000601:surgery*; D008297:Male; D008499:Medical Records; D011183:Postoperative Complications; D012086:Reoperation; D012189:Retrospective Studies; D013123:Spinal Fusion / Q000009:adverse effects* / Q000295:instrumentation* / Q000379:methods