The effects of additional hollow cylinder coated to external fixator screws for treating pilon fracture: A biomechanical perspective
Injury Mar 16, 2021
Ramlee MH, Seng GH, Felip AR, et al. - An external fixator is identified as a promising medical device that could aid in providing optimum stability and lowering the rate of complications in treating bone fracture during the intervention period. As introduction of more features such as material suitability and additional components can alter the biomechanics behavior of a device, researchers sought to determine the effects of additional hollow cylinder coated with external fixator screws in treating Type III pilon fracture via performing this study via finite element method. They used finite element models which have been corroborated with experimental data to simulate stresses at the pin-bone interface and relative micromovement at interfragmentary fractures during swing (70N load) and stance phases (350N load). They assigned all bones and external fixators with isotropic material properties while the cartilages were simulated with hyper-elastic. Polyethylene was assigned for the hollow cylinder because of its properties which are equivalent to the bone. In line with previously published literature, findings herein suggest that high stresses are unavoidable at the interface, luckily, those stresses did not surpass the ultimate strength of bone, which is safe for treating patients. In conclusion, an external fixator with coated screws provides superior stability if patients are allowed to bear weight bearing.
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