Biomechanical Efficacy of Various Anterior Spinal Fixation in Treatment of Thoraco-lumbar Spine Fracture

Ye-Soo Park; Hyoung-Jin Kim; Choong-Hyeok Choi; Won-Man Park; Yoon-Hyuk Kim

doi:10.12671/jkfs.2007.20.1.70

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Park, Kim, Choi, Park, and Kim: Biomechanical Efficacy of Various Anterior Spinal Fixation in Treatment of Thoraco-lumbar Spine Fracture

Original Article

Journal of the Korean Fracture Society 2007; 20(1): 70-75.

Published online: 14 June 2016

DOI: https://doi.org/10.12671/jkfs.2007.20.1.70

Biomechanical Efficacy of Various Anterior Spinal Fixation in Treatment of Thoraco-lumbar Spine Fracture

Ye-Soo Park, M.D., Hyoung-Jin Kim, M.D., Choong-Hyeok Choi, M.D.^*, Won-Man Park^†, Yoon-Hyuk Kim, Ph.D.^†

Department of Orthopaedic Surgery, Guri Hospital, Hanyang University College of Medicine, Seoul, Korea.

^*Department of Orthopaedic Surgery, Hanyang University College of Medicine, Seoul, Korea.

^†School of Advanced Technology, Kyung Hee University, Seoul, Korea.

Address reprint requests to: Yoon-Hyuk Kim, Ph.D. School of Advanced Technology, Kyung Hee University, 1, Seochondong, Giheung-gu, Yongin 449-701, Korea. Tel: 82-31-201-2028, Fax: 82-31-202-8106, yoonhkim@khu.ac.kr

Abstract

Purpose

To evaluate the biomechanical results according to various anterior spinal fixation methodology in the treatment of thoracolumbar spine fracture.

Materials and Methods

The comparative analysis of fixation method was evaluated by three dimensional finite element model using the 1 mm reconstruction image of CT. Authors evaluated the flexion, extension, lateral bending, torsional stresses with 12 fixation methods for the compression and burst fracture.

Results

In biomechanical analysis, stiffness of body-fixation device was more stable in two-rod system in compression fracture and was stable in one-rod, two-rod system in burst fracture, but two-rod system was showed over-increase of stiffness.

Conclusion

Authors recommend the usage of two-rod system in anterior fixation only and anterior one-rod system in anterior-posterior fixation.

Keywords: Thoracolumbar spine fracture, Anterior fixation, One-rod system

Figures and Tables

Fig. 1

The finite element models of thoracolumbar spine segments with different anteroposterior fixation techniques were developed.

(A) One-rod anterior fixation with posterior fixation (1R-M-P).

(B) Two-rod anterior fixation with posterior fixation (2R-M-P).

(C) Posterior fixation (0R-M-P).

Table 1

All datas of stiffness in construct varieties (Nm/°)

0R-NM-P: 0 rod - no midcolumn decompression - pedicle screw instrumentation, 1R-NM-NP: 1 rod - no midcolumn decompression - no pedicle screw instrumentation, 1R-NM-P: 1 rod - no midcolumn decompression - pedicle screw instrumentation, 2R-NM-NP: 2 rod - no midcolumn decompression - no pedicle screw instrumentation, 2R-NM-P: 2 rod - no midcolumn decompression - pedicle screw instrumentation, 0R-M-P: 0 rod - midcolumn decompression - pedicle screw instrumentation, 1R-M-NP: 1 rod - midcolumn decompression - no pedicle screw instrumentation, 1R-M-P: 1 rod - midcolumn decompression - pedicle screw instrumentation, 2R-M-NP: 2 rod - midcolumn decompression - no pedicle screw instrumentation, 2R-M-P: 2 rod - midcolumn decompression - pedicle screw instrumentation.

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