title: A novel fixation system for sacroiliac dislocation fracture: internal fixation system design and biomechanics analysis.
abstract: BACKGROUND
  Although there were many different types of fixation techniques for sacroiliac dislocation fracture, the treat remained challenging in posterior pelvic ring injury. The purpose of this study was to evaluate the biomechanical effects of a novel fixation system we designed.
  
  
  METHODS
  12 human cadavers (L3-pelvic-femora) were used to compare biomechanical stability after reconstruction on the same specimens in four conditions: (1) intact, (2) cable system, (3) plate-pedicle screw system, and (4) cable system and plate-pedicle screw combination system (combination system). Biomechanical testing was performed on a material testing machine for evaluating the stiffness of the pelvic fixation construct in compression and torsion.
  
  
  RESULTS
  The cable system and plate-pedicle screw system alone may be insufficient to resist vertical shearing and rotational loads; however the combination system for unstable sacroiliac dislocation fractures provided significantly greater stability than single plate-pedicle or cable fixation system.
  
  
  CONCLUSIONS
  The novel fixation system for unstable sacroiliac dislocation fractures produced sufficient stability in axial compression and axial rotation test in type C pelvic ring injuries. It may also offer a better solution for sacroiliac dislocation fractures.
authors.affiliation: Department of Orthopedics, Zhongnan Hospital of Wuhan University, No.169th Donghu Road, Wuchang District, Wuhan, Hubei, 430071, People's Republic of China. davidiswho@sina.com
authors.forename: Tian
authors.initials: T
authors.lastname: Dawei
authors.forename: Liu
authors.initials: L
authors.lastname: Na
authors.forename: Lei
authors.initials: L
authors.lastname: Jun
authors.forename: Jin
authors.initials: J
authors.lastname: Wei
authors.forename: Cai
authors.initials: C
authors.lastname: Lin
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D001696:Biomechanical Phenomena; D001860:Bone Plates; D001863:Bone Screws; D002102:Cadaver; D005260:Female; D005593:Fracture Fixation, Internal / Q000295:instrumentation* / Q000379:methods*; D050723:Fractures, Bone / Q000601:surgery*; D006801:Humans; D007085:Ilium / Q000293:injuries*; D016268:Internal Fixators; D004204:Joint Dislocations / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D012447:Sacrum / Q000293:injuries*