Pedicle Screw
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. The Influence of Thread Tap Mismatch on Pedicle Screw Pullout Strength
Resumo Objetivo Nosso objetivo foi estudar a resistência à extração “in vitro” do parafuso SpineGuard/Zavation Dynamic Surgical Guidance Z-Direct (Parafuso DSG Guia Cirúrgico Dinâmico, SpineGuard Inc, Boulder, Colorado, USA), um parafuso projetado para ser inserido utilizando a técnica de inserção direta. Métodos Os parafusos DSG de 5,5 e 6,5
Revista Brasileira de Ortopedia. Publicado em: 2022
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2. COMPARATIVE RESULTS BETWEEN OPEN AND MINIMALLY INVASIVE FUSION IN LUMBAR DEGENERATIVE DISEASE
RESUMO Objetivo: A fusão espinhal lombar é indicada para pacientes refratários ao tratamento tradicional da doença degenerativa do disco. O objetivo do presente estudo consistia em comparar os resultados peri- e pós-operatórios da cirurgia aberta convencional versus a cirurgia minimamente invasiva (MIS) na fusão lombar de 360º por via posterior com
Coluna/Columna. Publicado em: 14/11/2019
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3. TOMOGRAPHIC STUDY OF THE S2-ALAR-ILIAC SCREW TECHNIQUE IN BRAZILIAN MEN
RESUMO Objetivo O uso de parafusos pediculares foi um marco para a cirurgia moderna de coluna vertebral. Esse tipo de fixação, devido a sua biomecânica superior, deu maior poder de fixação, maior capacidade de resistir às forças de arrancamento e, portanto, maior estabilidade e menores taxas de pseudoartrose. A fixação da junção lombossacra, mesm
Coluna/Columna. Publicado em: 02/09/2019
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4. Clinical evaluation of a bone cement-injectable cannulated pedicle screw augmented with polymethylmethacrylate: 128 osteoporotic patients with 42 months of follow-up
OBJECTIVES: To evaluate the safety and efficacy of a novel bone cement-injectable cannulated pedicle screw augmented with polymethylmethacrylate in osteoporotic spinal surgery. METHODS: This study included 128 patients with osteoporosis (BMD T-score −3.2±1.9; range, −5.4 to -2.5) who underwent spinal decompression and instrumentation with a polymethyl
Clinics. Publicado em: 06/06/2019
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5. A biomechanical study on proximal junctional kyphosis following long-segment posterior spinal fusion
Posterior long-segment spinal fusion may lead to proximal junctional kyphosis (PJK). The present study sought to identify the appropriate fusion levels required in order to prevent PJK using finite element analysis. A finite element model was constructed based on the whole-spine computed tomography findings of a healthy adult. Nine commonly used posterior sp
Braz J Med Biol Res. Publicado em: 25/04/2019
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6. INFLUENCE OF DIAMETER AND GEOMETRY IN THE TAPPING OF THE PILOT HOLE IN PEDICLE SCREWS
RESUMO Objetivo: Avaliar o torque de inserção e a força de arrancamento de cada parafuso com diferentes diâmetros e machos. Métodos: Foram utilizados no estudo blocos de poliuterano com orifício piloto de 2,7mm, sendo feito um grupo experimentais com 5 blocos sendo avaliado o torque de inserção com torquímetro e avaliado o arrancamento de cada par
Coluna/Columna. Publicado em: 2019-03
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7. Clinical Application of Atlantoaxial Pedicle Screw Placement Assisted by a Modified 3D-Printed Navigation Template
OBJECTIVES: To investigate the primary clinical value of atlantoaxial pedicle screw placement assisted by a modified 3D-printed navigation template. METHODS: We retrospectively analyzed the cases of 17 patients treated from June 2015 to September 2016 with atlantoaxial pedicle screw placement assisted by a modified 3D-printed navigation template. All proce
Clinics. Publicado em: 19/07/2018
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8. Comparison of short-segment monoaxial and polyaxial pedicle screw fixation combined with intermediate screws in traumatic thoracolumbar fractures: a finite element study and clinical radiographic review
OBJECTIVES: No studies have compared monoaxial and polyaxial pedicle screws with regard to the von Mises stress of the instrumentation, intradiscal pressures of the adjacent segment and adjacent segment degeneration. METHODS: Short-segment monoaxial/polyaxial pedicle screw fixation techniques were compared using finite element methods, and the redistribute
Clinics. Publicado em: 2017-10
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9. Biomechanical study of the sacroiliac fracture fixation with titanium rods and pedicle screws
OBJECTIVES: To assess biomechanically different fixations means of the sacroiliac joint with pedicle screws and to compare the traditional head height with reduced ones. METHODS: We used a polyethylene model representing the pelvic ring and simulated a unilateral sacroiliac dislocation. We set up three different constructions: 1) two screws attached to a ro
Acta ortop. bras.. Publicado em: 2015-06
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10. Surgical treatment of the osteoporotic spine with bone cement-injectable cannulated pedicle screw fixation: technical description and preliminary application in 43 patients
OBJECTIVES: To describe a new approach for the application of polymethylmethacrylate augmentation of bone cement-injectable cannulated pedicle screws. METHODS: Between June 2010 and February 2013, 43 patients with degenerative spinal disease and osteoporosis (T-score <-2.5) underwent lumbar fusion using cement-injectable cannulated pedicle screws. Clinical
Clinics. Publicado em: 2015-02
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11. One-stage partial vertebrectomy, titanium mesh implantation and pedicle screw fixation in the treatment of thoracolumbar burst fractures through a posterior approach
OBJECTIVE: To analyze the clinical results of a partial vertebrectomy with titanium mesh implantation and pedicle screw fixation using a posterior approach to reconstruct the spine in the treatment of thoracolumbar burst fractures.
Clinics. Publicado em: 2014
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12. Influence of the pilot hole preparation and screw frequency insertion of the implant on the insertion torque and pulling out resistance / Influência do preparo do orifício piloto e da freqüencia de colocação do implante no seu torque de inserção e resistência ao arrancamento
The aim of the study was to evaluate the influence of the diameter of the pilot hole and the frequency of screw placement on pullout out resistance and insertion torque of the pedicle screw. Pedicle screws of 5, 6 and 7mm of the USS system for vertebral fixation were inserted into wood, polyurethane, polyethylene and bovine bone. The pilot hole for screw ins
Publicado em: 2007