Chinese Journal of Tissue Engineering Research ›› 2021, Vol. 25 ›› Issue (12): 1810-1814.doi: 10.3969/j.issn.2095-4344.3778

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Different configurations of anterior double-plate fixation in types B and C of sacroiliac joint dislocation: a finite element analysis

Shu Hui1, Huang Xiaowei2   

  1. 1Danyang People’s Hospital Affiliated to Nantong University, Danyang 212300, Jiangsu Province, China; 2The First People’s Hospital of Soochow University, Suzhou 215000, Jiangsu Province, China
  • Received:2020-04-18 Revised:2020-04-23 Accepted:2020-06-03 Online:2021-04-28 Published:2020-12-25
  • Contact: Shu Hui, Master, Associate chief physician, Danyang People’s Hospital Affiliated to Nantong University, Danyang 212300, Jiangsu Province, China
  • About author:Shu Hui, Master, Associate chief physician, Danyang People’s Hospital Affiliated to Nantong University, Danyang 212300, Jiangsu Province, Chin

Abstract: BACKGROUND: High-energy violence can lead to instability of pelvic ring structure. The primary purpose of surgical treatment of pelvic injury is to restore the continuity and stability of posterior pelvic ring as much as possible. To obtain anatomical reduction, anterior plate fixation can be used to maintain the stability of posterior pelvic ring. 
OBJECTIVE: To investigate the correlation between the configuration of anterior double-plate fixation and the biomechanical stability and to find the optimal configuration for anterior double-plate fixation for the treatment of type B and type C sacroiliac dislocation.
METHODS: A three-dimensional finite element model of the intact pelvic ring was established and validated. Then type B and type C sacroiliac dislocation models were constructed based on the intact pelvic model. Seven kinds of anterior plates with different angular orientation from 0° to 90° were implanted in two types of ipsilateral dislocated pelvic modes. The stability of models of sacroiliac joint dislocation fixed with different anterior plate configurations was recorded and analyzed.  
RESULTS AND CONCLUSION: (1) For type B and C sacroiliac joint dislocation, the maximal translation was 0.96 mm and 0.92 in 0°-fixation models. The minimum translation occurred in 75°-fixation model of 0.18 mm. (2) The maximal flexion was also found in 0°-fixation model of 2.05° in type B and of 1.9° in type C dislocation, and the minimum flexion existed in 60°-fixation model of 0.06°. (3) As for lateral bending, the minimal lateral bending occurred in 30°-fixation model of 0.01° in type B dislocation and in 45°-fixation model with the value of 0.11° in type C dislocation. (4) It is concluded that the angle of anterior double-plate fixation ranging from 45° to 75° demonstrated superior stability in both types B and C sacroiliac dislocation.


Key words: bone, pelvic ring, sacroiliac joint, dislocation, double plate, internal fixation, biomechanics, finite element analysi

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