J Korean Neurosurg Soc.  2016 Mar;59(2):91-97. 10.3340/jkns.2016.59.2.91.

Biomechanical Comparison of Spinal Fusion Methods Using Interspinous Process Compressor and Pedicle Screw Fixation System Based on Finite Element Method

  • 1Department of Medical System Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea.
  • 2School of Mechatronics, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea.
  • 3Department of Neurosurgery, Yonsei University College of Medicine, Seoul, Korea. CISTERN@yuhs.ac


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.
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.
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.
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.


Intervertebral disc degeneration; Pedicle screw; Interspinous device; Finite element analysis; Range of motion

MeSH Terms

Finite Element Analysis
Intervertebral Disc
Intervertebral Disc Degeneration
Range of Motion, Articular
Spinal Fusion*
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