title: Biomechanical Comparison of Spinal Fusion Methods Using Interspinous Process Compressor and Pedicle Screw Fixation System Based on Finite Element Method.
abstract: OBJECTIVE
  To investigate the biomechanical effects of a newly proposed Interspinous Process Compressor (IPC) and compare with pedicle screw fixation at surgical and adjacent levels of lumbar spine.
  
  
  METHODS
  A three dimensional finite element model of intact lumbar spine was constructed and two spinal fusion models using pedicle screw fixation system and a new type of interspinous devices, IPC, were developed. The biomechanical effects such as range of motion (ROM) and facet contact force were analyzed at surgical level (L3/4) and adjacent levels (L2/3, L4/5). In addition, the stress in adjacent intervertebral discs (D2, D4) was investigated.
  
  
  RESULTS
  The entire results show biomechanical parameters such as ROM, facet contact force, and stress in adjacent intervertebral discs were similar between PLIF and IPC models in all motions based on the assumption that the implants were perfectly fused with the spine.
  
  
  CONCLUSIONS
  The newly proposed fusion device, IPC, had similar fusion effect at surgical level, and biomechanical effects at adjacent levels were also similar with those of pedicle screw fixation system. However, for clinical applications, real fusion effect between spinous process and hooks, duration of fusion, and influence on spinous process need to be investigated through clinical study.
authors.affiliation: Department of Medical System Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea.
authors.forename: Jisoo
authors.initials: J
authors.lastname: Choi
authors.affiliation: Department of Medical System Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea.; School of Mechatronics, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea.
authors.forename: Sohee
authors.initials: S
authors.lastname: Kim
authors.affiliation: Department of Neurosurgery, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Dong-Ah
authors.initials: DA
authors.lastname: Shin
keywords: Finite element analysis; Interspinous device; Intervertebral disc degeneration; Pedicle screw; Range of motion