OBJETIVO: comparar a rigidez de um sistema de instrumentação da coluna vertebral composto por parafusos pediculares fixos com duplo bloqueio (interno e externo) com um sistema composto por parafusos pediculares fixos com bloqueio interno único, submetidos a forças de compressão. MÉTODOS: o modelo experimental utilizado nesses testes para avaliação dos sistemas de fixação foi elaborado de acordo com as normas descritas pela American Society for Testing Materials (ASTM) no ensaio F1717-04. Foram montados dois grupos, sendo o Grupo 1 composto pelos ensaios com parafusos fixos com sistema de duplo bloqueio e o Grupo 2, com parafusos fixos com bloqueio interno único. Foram utilizados três conjuntos de hastes e parafusos para cada grupo. Cada conjunto foi submetido a um teste biomecânico. Os componentes metálicos utilizados foram todos produzidos pela mesma empresa, apresentando mesma origem em relação à matéria-prima. Os modelos experimentais foram submetidos a testes mecânicos na máquina universal de ensaios EMIC, modelo EMIC DL 10000. RESULTADOS: os resultados obtidos no ensaio de compressão nas amostras do Grupo 1 apresentaram uma carga máxima média de 2104,15 N e uma carga de escoamento média de 1882,55 N. Os resultados obtidos no ensaio de compressão nas amostras do Grupo 2 apresentaram uma carga máxima média de 1420,5 N e uma carga de escoamento média de 1314,37 N. CONCLUSÃO: o sistema de parafusos fixos com duplo bloqueio (Grupo 1) apresentou maior resistência a forças de compressão quando comparado ao sistema de parafusos com travamento interno isolado.
Objective The objective of this study was to determine the prevalence of patients with colonization of methicillin-resistant Staphylococcus aureus (MRSA) in the nasal mucosa, who underwent elective spinal procedures. Methods Retrospective study of the medical records of all patients submitted to elective procedures, totaling 125 individuals in the period of 2015 and 2017, performed by two spinal surgeons of the Orthopedics and Traumatology Service of Hospital Mater Dei, Belo Horizonte, Minas Gerais. The pre-operative investigation of MRSA consisted of the collection of a nasal swab for microbiological culture. Results Of the 125 patients evaluated, three (2.4%) showed positive results for MRSA nasal colonization. This prevalence is consistent with the international literature, that ranges from 1.5 to 5.9%. Of these patients none had infection of the surgical wound, probably due to the preoperative prophylactic measures. Conclusions Despite the limitations of the study, we found that the prevalence of carriers of this nasal MRSA population is similar to that of populations worldwide . Level of evidence III; Retrospective Study.
OBJETIVO: Comparar a rigidez de um sistema de fixação pedicular composto por parafusos pediculares poliaxiais de travamento tipo Dytech® com outro composto por parafusos pediculares poliaxiais com travamento do tipo Lock 1®, submetidos a forças de compressão. MÉTODOS: A amostra utilizada para avaliar os sistemas de fixação respeitou as regras do padrão formulado pela American Society for Testing Materials (ASTM) no ensaio F1717-04. Os modelos foram divididos em: Grupo 1, composto pelos ensaios de parafusos poliaxiais com sistema Dytech® de travamento, e o Grupo 2, formado por parafusos poliaxiais com travamento tipo Lock 1®. Foram testados três conjuntos completos montados. Cada sistema foi testado uma única vez por ser esse um ensaio destrutivo. O instrumental implantado foi produzido com titânio de mesma origem. Os grupos experimentais foram submetidos a testes mecânicos na máquina universal de ensaios EMIC, modelo EMIC DL 10000®. RESULTADOS: Os resultados de compressão nas amostras do Grupo 1 tiveram uma carga máxima média de 967,17 N e carga de escoamento média de 804,71 N. Nas amostras do Grupo 2 tivemos uma carga máxima média de 906,04 N e carga de escoamento média de 834,56 N. A respeito da integridade dos instrumentais metálicos usados, não foi observado nenhum tipo de escorregamento ou soltura de porcas, parafusos ou outros componentes. CONCLUSÃO: O sistema de parafusos poliaxiais com travamento tipo Dytech® apresentou valores de rigidez maiores, enquanto o sistema de parafusos com travamento tipo Lock 1® mostrou deslocamento máximo maior.
Objective Morphometric study of the positioning of the cortical trajectory pedicle screw in the lumbar spine of Brazilian patients of different sexes and ages, through the use of computed tomography images, in order to obtain more reliable data about cortical screw insertion and the variations observed, providing assistance for a safer, more effective approach with fewer complications. Methods Selection of 100 patients from a database, alternating by sex, measuring the length, diameter, cephalic angulation, and lateral angulation of the vertebrae from L1 to L5. Results Statistically significant measurements were obtained for the four different parameters in relation to sex. The mean age was 56, with a minimum of 20 and a maximum of 87 years. The L4 and L5 screws showed a reduction in relation to the other levels, while the width showed a progressive increase starting at L3. Lateral angulation was the parameter with the least variation among the levels, while there was greater variation and a reduction from L4 to L5 in cephalic angulation. Conclusion Statistically significant results were obtained for length, diameter, lateral and cephalic angulation. Sex was a significant factor in spine surgery instrumentation using the cortical trajectory pedicle screw technique. Level of evidence I; Diagnostic study (investigation of an examination for diagnosis).
Objective To evaluate the immediate correction capacity of the Wood-Chêneau-Rigo brace (WCR), produced using digital technological resources and robotic engineering, in primary and secondary curves of adolescent idiopathic scoliosis (AIS). Methods A retrospective study was conducted of 138 patients with a diagnosis of AIS and who received a WCR brace from a laboratory that makes orthoses and orthopedic prostheses between 2019 and 2021. These individuals were submitted to an independent analysis of the radiographic parameters by a single researcher, the main outcome of which was the standardized measurement of the main and secondary curves using the Cobb method. The radiographs analyzed were performed in orthostasis before and immediately after the adaptation of the brace on the patient. The correction capacity was calculated as the ratio of the difference between the pre- and post-brace curves to the pre-brace curve. Results The mean correction with the WCR was 48.4% for the main curve and 41.0% for the secondary curve. The level of correction of the main curve was significantly higher in patients with a main curve with the apex of convexity in the thoracolumbar region (p = 0.004), especially in the left thoracolumbar region (p = 0.010); curves of magnitude between 10º and 24.9º (p <0.001); and curves classified as simple (p <0.001). Conclusion The use of the WCR, which is produced using modern technological resources, was effective in the immediate correction of AIS. Long-term studies on this new modality of conservative scoliosis treatment are necessary. Level of evidence III; Retrospective study.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.