title: Intra- and postoperative complications of navigated and conventional techniques in percutaneous iliosacral screw fixation after pelvic fractures: Results from the German Pelvic Trauma Registry.
abstract: BACKGROUND
  Percutaneous iliosacral screw placement following pelvic trauma is a very demanding technique involving a high rate of screw malpositions possibly associated with the risk of neurological damage or inadequate stability. In the conventional technique, the screw's correct entry point and the small target corridor for the iliosacral screw may be difficult to visualise using an image intensifier. 2D and 3D navigation techniques may therefore be helpful tools. The aim of this multicentre study was to evaluate the intra- and postoperative complications after percutaneous screw implantation by classifying the fractures using data from a prospective pelvic trauma registry. The a priori hypothesis was that the navigation techniques have lower rates of intraoperative and postoperative complications.
  
  
  METHODS
  This study is based on data from the prospective pelvic trauma registry introduced by the German Society of Traumatology and the German Section of the AO/ASIF International in 1991. The registry provides data on all patients with pelvic fractures treated between July 2008 and June 2011 at any one of the 23 Level I trauma centres contributing to the registry.
  
  
  RESULTS
  A total of 2615 patients were identified. Out of these a further analysis was performed in 597 patients suffering injuries of the SI joint (187×with surgical interventions) and 597 patients with sacral fractures (334×with surgical interventions). The rate of intraoperative complications was not significantly different, with 10/114 patients undergoing navigated techniques (8.8%) and 14/239 patients in the conventional group (5.9%) for percutaneous screw implantation (p=0.4242). Postoperative complications were analysed in 30/114 patients in the navigated group (26.3%) and in 70/239 patients (29.3%) in the conventional group (p=0.6542). Patients who underwent no surgery had with 66/197 cases (33.5%) a relatively high rate of complications during their hospital stay. The rate of surgically-treated fractures was higher in the group with more unstable Type-C fractures, but the fracture classification had no significant influence on the rate of complications.
  
  
  CONCLUSIONS
  In this prospective multicentre study, the 2D/3D navigation techniques revealed similar results for the rate of intraoperative and postoperative complications compared to the conventional technique. The rate of neurological complications was significantly higher in the navigated group.
authors.affiliation: Department of Orthopaedic and Trauma Surgery, University of Freiburg Medical Center, Hugstetter Strasse 55, 79106 Freiburg, Germany. Electronic address: joern.zwingmann@uniklinik-freiburg.de.
authors.forename: Jörn
authors.initials: J
authors.lastname: Zwingmann
authors.forename: Norbert P
authors.initials: NP
authors.lastname: Südkamp
authors.forename: Benjamin
authors.initials: B
authors.lastname: König
authors.forename: Ulf
authors.initials: U
authors.lastname: Culemann
authors.forename: Tim
authors.initials: T
authors.lastname: Pohlemann
authors.forename: Emin
authors.initials: E
authors.lastname: Aghayev
authors.forename: Hagen
authors.initials: H
authors.lastname: Schmal
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001863:Bone Screws; D005260:Female; D005593:Fracture Fixation, Internal / Q000009:adverse effects* / Q000379:methods; D050723:Fractures, Bone / Q000145:classification / Q000601:surgery*; D006801:Humans; D007085:Ilium / Q000601:surgery; D016268:Internal Fixators / Q000009:adverse effects; D007431:Intraoperative Complications / Q000453:epidemiology*; D008297:Male; D008875:Middle Aged; D010384:Pelvic Bones / Q000293:injuries* / Q000601:surgery; D011183:Postoperative Complications / Q000453:epidemiology*; D011446:Prospective Studies; D012447:Sacrum / Q000601:surgery
keywords: German Pelvic Trauma Registry; Iliosacral screw; Navigation; Pelvic fracture; SI screw