title: Comparative studies of cervical spine anterior stabilization systems--Finite element analysis.
abstract: BACKGROUND
  The object of the study was to assess the impact of one-level stabilization of the cervical spine for both anterior static and dynamic plates. Segments C2-C6 of the cervical spine, were investigated, from which was determined the stress and strain fields in the region of implantation and adjacent motion segments. The purpose was the comparison of changes that affect the individual stabilizers.
  
  
  METHODS
  For testing we used finite element analysis. The cervical spine model takes into account local spondylodesis. The study includes both an intact anatomical model and a model with implant stabilization.
  
  
  RESULTS
  The analysis covered the model loaded with a moment of force for 1 Nm in the sagittal plane during movement. We compared both the modeled response of the whole fragment C2-C6 and the response of individual motion segments. The largest limitation of range of motion occurred after implantation with static plates. The study also showed that the introduction of the one-level stabilization resulted in an increase in stress in intervertebral disc endplates of adjacent segments.
  
  
  CONCLUSIONS
  The results indicate that the increase in stress caused by stiffening may result in disorders in remodeling of bone structures. The use of dynamic plates showed improved continuity strains in the tested spine, thereby causing remodeling most similar to the physiological state and reducing the stresses in adjacent segments.
authors: University of Zielona Góra, Zielona Góra, Poland. Electronic address: a.mackiewicz@ibem.uz.zgora.pl.
authors: A
authors: A
authors: Mackiewicz
authors: St. Raphael Hospital in Krakow, Krakow, Poland. Electronic address: mariusz.banach@scanmed.pl.
authors: M
authors: M
authors: Banach
authors: University of Zielona Góra, Zielona Góra, Poland. Electronic address: a.denisiewicz@ib.uz.zgora.pl.
authors: A
authors: A
authors: Denisiewicz
authors: University of Zielona Góra, Zielona Góra, Poland. Electronic address: r.bedzinski@ibem.uz.zgora.pl.
authors: R
authors: R
authors: Bedzinski
mesh_terms: D000328:Adult; D001672:Biocompatible Materials; D001696:Biomechanical Phenomena; D002574:Cervical Vertebrae / Q000000981:diagnostic imaging / Q000473:pathology / Q000502:physiology / Q000601:surgery*; D003198:Computer Simulation; D020342:Finite Element Analysis; D006801:Humans; D007403:Intervertebral Disc / Q000502:physiology / Q000601:surgery*; D008279:Magnetic Resonance Imaging; D008297:Male; D008953:Models, Anatomic; D009038:Motion; D011312:Pressure; D019736:Prostheses and Implants; D011474:Prosthesis Design; D016059:Range of Motion, Articular / Q000502:physiology; D013123:Spinal Fusion / Q000295:instrumentation* / Q000379:methods*; D014057:Tomography, X-Ray Computed
chemical_list: D001672:Biocompatible Materials
keywords: Anterior cervical fusion; Cervical spine; Finite element analysis; Stabilization plate; Stiffness