title: The cement-augmented transiliacal internal fixator (caTIFI): an innovative surgical technique for stabilization of fragility fractures of the pelvis.
abstract: BACKGROUND
  Analyzing the different age groups in a population who suffered a pelvic ring fracture it becomes obvious that there are important differences between the pelvic ring lesions of an elderly patient compared to a young adult concerning trauma mechanism, fracture pattern and therapeutic options. In the elderly patient it is very important to achieve maximum of stability if surgery is necessary in order to avoid early failure of the ostheosynthesis under mobilization with full weight bearing.
  
  
  METHODS
  15 patients (14 female) with fragility fractures of the pelvis that required surgical stabilization were eligible to participate in this study from December 2012 to December 2014. Such details were documented and analysed as patient demographics, mechanism of injury, fracture classification, operative treatment and postoperative radiological parameters of achieved bone-implant interface.
  
  
  RESULTS
  The average age of the patients was 79.9 years (SD 9.0 years). According to Rommens five patients had a fragility fracture of the pelvis Type II-c, one a Type III-c, six a Type IV-b and three a Type IV-c. Four patients were treated by a cement augmented transiliac internal fixation (caTIFI). Seven patients received a cement augmented iliolumbar fixation. In all these patients the Schanz screws applied to the ilium were placed in an oblique dorsoventral direction into the supraacetabular bone canal (mean length of screws 100 ± 20mm, max. 135 mm, min. 70 mm). Even though in four patients the iliosacral joint was hit tangential and one cortex perforation without any cement leakage appeared no revision surgery was necessary. Overall the clinical findings including mobilisation with full weight bearing showed a sufficient mechanically stability in all patients.
  
  
  CONCLUSIONS
  The focus of this study was to describe the modified surgical technique of the caTIFI with placing the Schanz screws from the posterior superior iliac spine to the anterior inferior iliac spine into the supraacetabular bone canal. Usage of cannulated and perforated Schanz screws gives the opportunity to control the correct position of the screws before implanting them. Another advantage is that additional stability can be obtained by cement augmentation. We believe that the new technique of the caTIFI provides a greater intraoperative versatility and a greater mechanical stability for fragility fractures of the pelvis.
authors.affiliation: Clinic of Trauma Surgery, University of Regensburg, Regensburg, Germany. Electronic address: paul.schmitz@ukr.de.
authors.forename: Paul
authors.initials: P
authors.lastname: Schmitz
authors.affiliation: Clinic of Trauma Surgery, University of Regensburg, Regensburg, Germany.
authors.forename: Florian
authors.initials: F
authors.lastname: Baumann
authors.affiliation: Clinic of Trauma Surgery, University of Regensburg, Regensburg, Germany.
authors.forename: Stephan
authors.initials: S
authors.lastname: Grechenig
authors.affiliation: Department of Trauma Surgery, Klinikum Wolfsburg, Wolfsburg, Germany.
authors.forename: Axel
authors.initials: A
authors.lastname: Gaensslen
authors.affiliation: Clinic of Trauma Surgery, University of Regensburg, Regensburg, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Nerlich
authors.affiliation: Clinic of Trauma Surgery, University of Regensburg, Regensburg, Germany.
authors.forename: Michael B
authors.initials: MB
authors.lastname: Müller
mesh_terms: D000369:Aged, 80 and over; D001843:Bone Cements; D001863:Bone Screws; D005260:Female; D005593:Fracture Fixation, Internal / Q000295:instrumentation / Q000379:methods*; D017102:Fracture Healing; D050723:Fractures, Bone / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery*; D016330:Frail Elderly; D006801:Humans; D007085:Ilium / Q000000981:diagnostic imaging / Q000293:injuries / Q000601:surgery; D008297:Male; D019060:Minimally Invasive Surgical Procedures; D058866:Osteoporotic Fractures / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery*; D010384:Pelvic Bones / Q000293:injuries* / Q000601:surgery; D011859:Radiography; D012447:Sacrum / Q000000981:diagnostic imaging / Q000293:injuries / Q000601:surgery; D016896:Treatment Outcome; D016474:Weight-Bearing
chemical_list: D001843:Bone Cements
keywords: cement augmentation; fragility fracture of pelvis; transiliac screws