Chinese Journal of Tissue Engineering Research ›› 2010, Vol. 14 ›› Issue (13): 2329-2332.doi: 10.3969/j.issn.1673-8225.2010.13.013

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Three-dimensional finite element analysis of screw-plate fixation and joint lag screws fixation for sacroiliac joint dislocation

Zhang Jing-liao1, Gu Li-qiang2, Zhang Mei-chao3, Liu Shi-Jing1   

  1. 1 Department of Orthopaedics, 155th Central Hospital of Chinese PLA, Kaifeng  475003, Henan Province, China; 2 Department of Orthopaedic, Trauma and Microsurgery, First Affiliated Hospital of Sun Yat-sen University, Guangzhou  510080, Guangdong Province, China; 3 Institute of Clinical Anatomy, Southern Medical University, Guangzhou  510515, Guangdong Province, China
  • Online:2010-03-26 Published:2010-03-26
  • Contact: Gu Li-qiang, Doctor, Professor, Department of Orthopaedic, Trauma and Microsurgery, First Affiliated Hospital of Sun Yat-sen University, Guangzhou 510080, Guangdong Province, China guliqiang_gz@yahoo.com.cn
  • About author:Zhang Jing-liao☆, Doctor, Attending physician, Department of Orthopaedics, 155th Central Hospital of Chinese PLA, Kaifeng 475003, Henan Province, China zhangkinglios@163.com

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Abstract:

BACKGROUND: Finite element analysis (FEA) can be applied to compare stress of complicated structure, morphology, load, and material property, and it is being considered as an important method in orthopaedic biomechanical research.
OBJECTIVE: To prepare sacroiliac joint dislocation models by FEA, and to compare biomechanics stability of two internal fixation treatments for sacroiliac joint dislocation.
METHODS: All the ligaments situated in half sacroiliac joint were cut on the normal three-dimensional finite element model of pelvis. These ligaments include anterior sacroiliac ligaments, posterior sacroiliac ligaments, interosseous sacroiliac ligaments, sacrotuberous ligaments and sacrospinous ligaments. Thus, the pelvic model of sacroiliac joint dislocation was established. In order to simulate the treatment with plates and screws on dislocation of pelvic sacroiliac joint via anterior path, the two reconstructive plates and the six standard screws were added into the model, as well as the two sacroiliac joint lag screws via posterior path. Then, the same load was exerted on different model respectively. At the end, the none-line solution was analyzed.
MAIN OUTCOME MEASURES: The stress, strain and displacement nephograms were obtained under axial load.
RESULTS AND CONCLUSIONS: The high-precision three dimensional finite element model of pelvic sacroiliac dislocation was established. The biomechanical stability and intensity of the two methods of internal fixations were analyzed and compared by the stress-strain nephogram. The consequences indicated that the fixation stability of two sacroiliac joint lag screws was larger than that of two reconstruction plates via anterior path. The total displacement of the former was less then that of the latter, and the stress of the former was not clearly concentrated on some sites. The fixation intensity of the former was larger, and the stability of fixed pelvis was better. The method on analyzing biomechanics stability of two internal fixation treatments on sacroiliac joint dislocation by the three-dimensional finite element analysis has the advantages of the higher authenticity, precision and repeatability. The result is identical to those of other experimental methods. Accordingly, this method can be applied to the research of pelvis injuries clinically.

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