Browsing by Author "Valenzuela, Joaquin"

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    Periprosthetic Hip Fracture due to Ballistic Injuries
    (2024) Sandoval, Felipe; Valenzuela, Joaquin; Carmona, Maximiliano; Guiloff, Benjamin; Salgado, Martin
    Periprosthetic hip fractures are a common cause for revision. To date, however, there are no reports of periprosthetic fractures (PFs) in total hip arthroplasty caused by ballistic injury (BI). There are no current recommendations on the management of this pathology in the literature. The objective of this paper is to report on 2 successfully treated cases of PF caused by BIs. Additionally, a brief review of the literature regarding open fracture secondary to BIs is carried out. What we consider appropriate initial and definitive management for these patients is outlined. According to our clinical results and current evidence, adequate management for a BI Vancouver B1 femoral PF consists of early antibiotic therapy, surgical debridement, osteosynthesis with variable angle locking plate, structural allograft, cerclage wires, and negative pressure wound therapy. (c) 2024 The Authors. Published by Elsevier Inc. on behalf of The American Association of Hip and Knee Surgeons. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).
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    Symplectic Hamiltonian Finite Element Methods for Semilinear Wave Propagation
    (2024) Sanchez, Manuel A.; Valenzuela, Joaquin
    This paper presents Hamiltonian finite element methods for approximating semilinear wave propagation problems, including the nonlinear Klein-Gordon and sine-Gordon equations. The aim is to obtain accurate high-order approximations while conserving physical quantities of interest such as energy. To achieve conservation properties at a discrete level, we propose semidiscrete schemes based on two Hamiltonian structures of the equation. These include Mixed finite element methods, discontinuous Galerkin methods, and hybridizable discontinuous Galerkin methods (HDG). In particular, we propose a new class of DG methods using time operators to define the numerical traces, ultimately leading to an energy-conserving scheme. Time discretization uses Symplectic explicit-partitioned and diagonally-implicit Runge-Kutta schemes. Furthermore, the paper showcases several numerical examples that demonstrate the accuracy and energy conservation properties of the approximations, along with the simulation of soliton cloning.