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There are different surgical methods for primary malignant tumor located at distal tibia. Double-strut fibula ankle arthrodesis is an alternative option. The purpose of this study was to investigate the biomechanical effect of double-strut fibula ankle arthrodesis by finite element analysis (FEA).
Computer-aided design software was used to establish three-dimension models. Three different models were constructed: normal tibia-fibula-talus complex (model A), double-strut fibula ankle arthrodesis (model B), and reconstruction by ipsilateral fibula (model C).
Researchers used FEA to evaluate and compare the biomechanical characteristics of these constructs. Simulated load of 600 N was applied to the tibial plateau to simulate balanced single-foot standing. Output results representing the model von Mises stress and displacement of the components were analyzed.
Results:
--Construct stiffness was increased when the internal plate fixation was used.
--For axial load, model B (1460.5 N/mm) was stiffer than the construct of model A (524.8 N/mm), and model C (636.6 N/mm), indicating model B was more stable.
--Maximum stress on the fibular graft occurred on the proximal end. The von Mises stress and stress distribution of fibular graft in model B (71.4 MPa) and model C (67.8 MPa) were similar.
--In model B, the ipsilateral fibula in model B has a higher value of stress (16.1 MPa) than that in model A (0.5 MPa), indicating the ipsilateral fibula shared load after fusion with talus.
In conclusion, these results indicate that a double-strut fibula ankle arthrodesis is a viable option for treating a distal tibia defect, and that the ipsilateral fibula shares load after fusion with the talus.
Source: https://josr-online.biomedcentral.com/articles/10.1186/s13018-021-02362-0
Computer-aided design software was used to establish three-dimension models. Three different models were constructed: normal tibia-fibula-talus complex (model A), double-strut fibula ankle arthrodesis (model B), and reconstruction by ipsilateral fibula (model C).
Researchers used FEA to evaluate and compare the biomechanical characteristics of these constructs. Simulated load of 600 N was applied to the tibial plateau to simulate balanced single-foot standing. Output results representing the model von Mises stress and displacement of the components were analyzed.
Results:
--Construct stiffness was increased when the internal plate fixation was used.
--For axial load, model B (1460.5 N/mm) was stiffer than the construct of model A (524.8 N/mm), and model C (636.6 N/mm), indicating model B was more stable.
--Maximum stress on the fibular graft occurred on the proximal end. The von Mises stress and stress distribution of fibular graft in model B (71.4 MPa) and model C (67.8 MPa) were similar.
--In model B, the ipsilateral fibula in model B has a higher value of stress (16.1 MPa) than that in model A (0.5 MPa), indicating the ipsilateral fibula shared load after fusion with talus.
In conclusion, these results indicate that a double-strut fibula ankle arthrodesis is a viable option for treating a distal tibia defect, and that the ipsilateral fibula shares load after fusion with the talus.
Source: https://josr-online.biomedcentral.com/articles/10.1186/s13018-021-02362-0
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Is double-strut fibula ankle arthrodesis a reliable reconstruction for bone defect after distal tibia tumor resection?—a finite element study based on promising clinical outcomes
Background There are different surgical methods for primary malignant tumor located at distal tibia. Previous studies have reported that double-strut fibula ankle arthrodesis is an alternative option.
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