Axial loading to predict the posture deviation of the tibial fragment elongated with Ilizarov external fixation

doi:10.3969/j.issn.2095-4344.0246

Abstract

Abstract:

BACKGROUND: It is difficult to predict the spatial displacement accurately and timely during the elongation of tibia in the osteotomy by using Ilizarov external fixation.

OBJECTIVE: To load axial load, simulate the acquisition of three-dimensional (3D) models with Ilizarov external fixation by finite element analysis software (ANSYS), establish the calculation method of the axial relative displacement, and provide theoretical basis and adjustment method for clinical monitoring the quality of osteotomy length.

METHODS: The 3D model was built in Mimics by using CT scan of the bone-Ilizarov external fixator (four-bar eccentric distribution) in a patient. The model was optimized in Solidworks. The tibia elongation was assumed to be 20 mm. The model was established according to the horizontal displacement of distal fragment in coronal sections (0, 4, 7, 10, 13 and 16 mm). The axial force of Ilizarov external fixator was set to 200 N and it was analyzed by finite element method through ANSYS static module. The coordinate position of net force was calculated according to the load data, and the magnitude and direction of the tibial osteotoma were calculated.

RESULTS AND CONCLUSION: (1) The models of different horizontal displacement of the distal fragment in coronal section (0, 4, 7, 10, 13 and 16 mm) were loaded. The horizontal offset (0.8, 2.9, 5.4, 8.3, 11.8, 14.9 mm) and errors (0.8, 1.1, 1.6, 1.7, 1.2, 1.1 mm) were calculated respectively. (2) When the calculation error was not less than 1.7 mm, the displacement direction of the distal fragment could be determined, which provided a quantitative basis for clinical treatment; it calculated the external fixed adjustment method and corrected the deformity. (3) In conclusion, the model of Ilizarov external fixation is analyzed by using finite element method, and the mathematical model is established to calculate the axial offset of the distal fragment. When the calculation error is not less than 1.7 mm, the distal fragment displacement can be determined according to the coordinate position of net force, which can guide the regulation of Ilizarov external fixation in clinic, and avoid bone lengthening complications.

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: Bone Lengthening, Finite Element Analysis, External Fixators, Tissue Engineering

CLC Number:

R318

Li Kai, Tan Qi, Zhang Tao, Hou Shu-jun, Liu Yan-shi, Zhang Xing-peng. Axial loading to predict the posture deviation of the tibial fragment elongated with Ilizarov external fixation[J]. Chinese Journal of Tissue Engineering Research, 2018, 22(23): 3675-3680.

Figures/Tables 1

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