title: Clinically relevant complications related to pedicle screw placement in thoracolumbar surgery and their management: a literature review of 35,630 pedicle screws.
abstract: OBJECTIVE
  The technique of pedicle screw insertion is a mainstay of spinal instrumentation. Some of its potential complications are clinically relevant and may require reoperation or further postoperative care.
  
  
  METHODS
  A literature search was performed using MEDLINE (between 1999 and June 2011) for studies on pedicle screw placement in thoracolumbar surgery. The authors included randomized controlled trials, case-control studies, and case series (≥ 20 patients) from the English-, German-, and French-language literature. The authors assessed study type, the number of patients, the anatomical area, the number of pedicle screws, duration of follow-up, type of pedicle screw placement, incidence of complications, and type of complication. The management of specific complications is discussed.
  
  
  RESULTS
  Thirty-nine articles with 46 patient groups were reviewed with a total of 35,630 pedicle screws. One study was a randomized controlled trial, 8 were case-control studies, and the remaining articles were case series. Dural lesions and irritation of nerve roots were reported in a mean of 0.18% and 0.19% per pedicle screws, respectively. Thirty-two patients in 10 studies (of 5654 patients from all 39 studies) required further revision surgeries for misplaced pedicle screws causing neurological problems. None of the analyzed studies reported vascular complications, and only 2 studies reported visceral complications of clinical significance.
  
  
  CONCLUSIONS
  Pedicle screw placement in the thoracolumbar region is a safe procedure with an overall high accuracy and a very low rate of clinically relevant complications.
authors.affiliation: Department of Neurosurgery, Geneva University Medical Center, Faculty of Medicine, University of Geneva, Switzerland.
authors.forename: Oliver P
authors.initials: OP
authors.lastname: Gautschi
authors.forename: Bawarjan
authors.initials: B
authors.lastname: Schatlo
authors.forename: Karl
authors.initials: K
authors.lastname: Schaller
authors.forename: Enrico
authors.initials: E
authors.lastname: Tessitore
mesh_terms: D001863:Bone Screws / Q000009:adverse effects*; D019468:Disease Management; D006801:Humans; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging / Q000601:surgery*; D019637:Orthopedic Procedures / Q000009:adverse effects* / Q000295:instrumentation; D011183:Postoperative Complications / Q000209:etiology / Q000628:therapy*; D011859:Radiography; D013904:Thoracic Vertebrae / Q000000981:diagnostic imaging / Q000601:surgery*