Establishment of a Finite Element Model and Biomechanical Analysis of Different Fixation
Methods for Total Talar Prosthesis Replacement
Qian Dong Yang, Le Chang, Xuting Bian, Lin Ma, Kang Lai Tang and Xu Tao*
The First Affiliated Hospital of Military Medical University of the Army, China
*Corresponding Author: Xu Tao, The First Affiliated Hospital of Military Medical University of the Army, China.
July 12, 2022; Published: August 22, 2022
As a new technology, three-dimensional (3D)-printed personalized talar prostheses are fixed via different methods, including fixing the subtalar joint and talonavicular joint with screws and fixing only the subtalar joint with screws and fixation without screws. No biomechanical study has been conducted yet. We aimed to build a 3D finite element model to compare the biomechanical effects of different fixation methods. With 3D CT and MRI data of a volunteer's foot, Mimics research 19.0 and Geomagic wrap 2017 software were used to complete the geometric reconstruction of bone and cartilage, and then the data were input into NX12.0 software to build finite element models. Finally, the models were imported into Abaqus 6.14 software for meshing and assigning material properties and for simulating the different biomechanical characteristics in three gait phases. The pressure changes in the articular surface around the talus or the prosthesis, the micromotion of the talus and the prosthesis and ankle motion were measured. The 3D finite element model created in this study has been verified to be consistent with those in previous studies. The results showed that screw fixation of the prosthesis in different gait phases mainly increased the pressure on the tibial-talus articular surface and decreased the pressure on the fused articular surface and joint micromotion, which may hinder ankle motion. The indicator values were nearly the same in the models of fixation without screws and the healthy state. Fixation of the prosthesis without screws yielded values most similar to healthy values.
Keywords: Talar prosthesis replacement; Biomechanical analysis; Finite element
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