Abstract
OBJETIVO: Avaliar comparativamente a força de tração (F) determinada com a utilização de parafuso excêntrico em placas do tipo compressão dinâmica larga (DCP-L). MÉTODOS: Foram utilizadas três placas de tipo DCP-L de quatro fabricantes nacionais, todas em aço inoxidável austenítico ASTM F 138, e instrumentais disponíveis nas caixas de 4.5mm. As placas foram fixadas a dois corpos de prova sintéticos de polietileno e a força de tração foi obtida pela utilização de parafuso de 4.5mm, introduzido em furo excêntrico, realizado com instrumentais específicos de cada fabricante. Os resultados foram obtidos por uma máquina servo-hidráulica BME 2000 160/AT, Brasválvula. Os implantes foram divididos em grupos. (Fab. I, II, III, IV). Os testes foram interrompidos após atingir uma força de aperto do parafuso excêntrico de 5 N. RESULTADOS: O grupo I apresentou média de Força máxima (F Max.) 80.58 N; grupo II: F Max. 81.63 N; Grupo III: F Max. 36.32N; Grupo IV: F Max. 37.52N. Utilizando a Análise de Variância de Krukal-Wallis (ANOVA não paramétrica), sendo p= 0,05 existe diferença significativa na força máxima entre os grupos (p = 0,039). CONCLUSÃO: As placas DCP-L do grupo II apresentaram maior força (N) com fixação da placa utilizando parafuso excêntrico. Nível de Evidência: Nível III, estudo analítico.
Highlights
The main goal of internal fracture fixation is to achieve full limb function and fast patient rehabilitation as early as possible
Because of the relevance of the use of the absolute stability principle, traction force analyses were conducted using the eccentric screw in 4.5mm dynamic compression plate (DCP-L) plates from different Brazilian manufacturers, aiming to comparatively analyze their results
Through scientific studies it was verified that compression at the fracture focus determines bone necrosis, yet there is no specification in absolute values when this phenomenon compromises the treatment.[9]
Summary
The main goal of internal fracture fixation is to achieve full limb function and fast patient rehabilitation as early as possible For this purpose it is necessary to perform fracture stabilization using either an absolute or relative stability technique.[1] In the treatment of fractures professionals aim to reduce mobility at the fracture focus, which may be compromised under functional load, and the only technique that will effectively abolish movement at the fracture focus is interfragmentary compression, which will create conditions for absolute stability.[2] Perren et al, in 1967, in pursuit of rigid osteosyntheses and absolute stability, developed a new self-compressing plate: the Dynamic Compression Plate (DCP®).[3,4] This name stems from its ability to provide axial compression without the need for a tensor device, by exercising compression at the fracture focus through eccentric screw insertion.[5] The hole of the DCP-L plate features a slope at one of the ends. Because of the relevance of the use of the absolute stability principle, traction force analyses were conducted using the eccentric screw in 4.5mm DCP-L plates from different Brazilian manufacturers, aiming to comparatively analyze their results
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