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JYMS : Journal of Yeungnam Medical Science

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Original Article
Analysis of Compression Behavior on Intervertebral Disc L4-5 in Pedicle Screw System Instrumented Lumbar Spine under Follower Load.
Myun whan Ahn, Jong chul Ahn, Su ho Lee, Il sub Chung, Choon yeol Lee, Jang woo Lee
Yeungnam Univ J Med. 2003;20(2):160-168.   Published online December 31, 2003
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AbstractAbstract PDF
Confirm the stability of intervertebral disc sustaining each fused lumbar spine cases, comparing vertical compression, A-P shear force and rotational moment on intervertebral disc of instrumented lumbar spine with simple vertical compression load and follower load using finite element analysis. MATERIALS AND METHODS: We analyze the stability of intervertebral disc L4-5 supporting fused lumbar spine segments. After performing finite element modelling about L1-L5 lumbar vertebral column and L1-L4 each fusion level pedicle screw system for fused lumbar spine fine element model. Intervertebral discs with complex structure and mechanical properties was modeled using spring element that compensate stiffness and tube-to-tube contact element was employed to give follower load. Performing geometrical non-linear analysis. RESULTS: The differences of intervertebral disc L4-5 behavior under the follower compression load in comparision with vertical compression load are as follows. CONCLUSION: As a result of finite element interpretation of instrumented lumbar spine, the stability of L4-5 sustaining fused lumbar segment, the long level fused lumbar spine observed hing stability under follower load. This research method can be the basis tool of effects prediction for instrumentation, a invention of a more precious finite element interpretation model which consider the role of muscle around the spine is loaded.


Citations to this article as recorded by  
  • Spinal Stability Evaluation According to the Change in the Spinal Fixation Segment Based on Finite Element Analysis
    Cheol-Jeong Kim, Seung Min Son, Jin-Young Heo, Chi-Seung Lee
    Journal of the Computational Structural Engineering Institute of Korea.2020; 33(3): 145.     CrossRef
Thoracolumbar Spine Injury.
Myun Whan Ahn
Yeungnam Univ J Med. 2002;19(2):73-91.   Published online December 31, 2002
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  • 4 Download
AbstractAbstract PDF
Method of management of the spine injury should be determined, based on the status of neurological injury as well as on the presence of traumatic instability. At the thoracic and lumbar spine, patterns of neurological injury are different from the cervical spine due to their neuro-anatomical characteristics. Especially, at the thoracolumbar junction, neurological injury patterns with their respective prognosis vary from the complete cord injury or conus medullaris syndrome to the cauda equina syndrome according to the injury level. The concept of Holdsworth's instability based on the posterior ligament complex theory has evolved into the current 3-column theory of Denis. Flexion-rotation injury and fracture-dislocation are well known to be unstable that surgical fixation is frequently needed for these injuries. However, there have been some controversies for the stability of burst fractures and their treatment, such as indirect or direct decompression and anterior or posterior approach. In this article, current concepts and management of traumatic instabilities at the thoracic and lumbar spine have been reviewed and summarized.

JYMS : Journal of Yeungnam Medical Science