Mechanical stability of different internal fixations for complex pelvic fractures by finite element analysis

doi:10.3969/j.issn.2095-4344.0352

Abstract

Abstract:

BACKGROUND: Open reduction and internal fixation can be used for different types of pelvic fractures, which can reduce the incidence of complications. However, there is a lack of mechanical study on its fixation effect.

OBJECTIVE: To investigate the mechanical stability of different kinds of internal fixations for complex pelvic fractures by finite element analysis.

METHODS: One healthy man was selected. Two-dimensional CT data were obtained by 64-slice spiral CT scan. The data were obtained by medical digital imaging and stored by communication format. The finite element model of the pelvis was established using the software of Mimics, Geomagic studio and Abaqus, and the finite element model of the complex pelvic fracture was established. Three kinds of internal fixators were implanted to treat the pelvic fracture, and then 500 N vertical load was applied to the sacrum. The corresponding mechanical parameters were calculated, and the mechanical stability of different internal fixation methods was compared.

RESULTS AND CONCLUSION: (1) The displacement of a point in the normal three-dimensional finite element model of pelvis was 0.53 mm, and the stress load was normal, the force displacement of the sacroiliac joint was similar to the previous finite element biomechanical analysis, suggesting that the finite element model was established successfully. (2) Under the vertical load of 500 N, the maximal stress of screw fixation was 440.85 MPa, which was concentrated on the fracture parts. The maximum stress of the reconstructed bone plate was 1 332.56 MPa, concentrating on the nail-plate connection. The maximum force of the outer stent was 1 834.85 MPa, concentrating on the nail-plate connection. (3) Under the vertical load of 500 N, the order of strain distribution, overall displacement, and separation displacement values was as follows: screw fixation < reconstructed bone plate < outer stent (all P < 0.05). (4) These results indicate that the screw fixation obtains the best stability for complex pelvic fractures compared with other methods through finite element analysis. In clinical practice of pelvic fractures, individualized treatment is recommended.

中国组织工程研究杂志出版内容重点：人工关节；骨植入物；脊柱；骨折；内固定；数字化骨科；组织工程

Key words: Pelvis, Fractures, Bone, Bone Nails, Internal Fixators, Biomechanics, Finite Element Analysis, Tissue Engineering

CLC Number:

R318

Wang Xu-jin, Fang Shi-yuan, Xu Lei, Yang Jia-zhao. Mechanical stability of different internal fixations for complex pelvic fractures by finite element analysis[J]. Chinese Journal of Tissue Engineering Research, 2018, 22(27): 4354-4358.

Figures/Tables 1

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