Abstract
Foi realizado estudo experimental com o objetivo de avaliar os efeitos da aplicação da força de compressão e distração (aproximação e afastamento) sobre os implantes colocados nos pedículos vertebrais. Foram utilizados no estudo os segmentos vertebrais T8-T9, T10-T11, T12-L1, L2-L3 e L4-L5 de suínos da raça Landsark. Cada segmento vertebral foi fixado com implantes pediculares, tendo sido aplicada força de compressão ou distração com deslocamento que variou de 5,1 mm a 9,35 mm. O deslocamento provocado pela aplicação das forças foi mensurado em quatro pontos do segmento vertebral: A (porção anterior do corpo vertebral), B (porção média do corpo vertebral), C (porção posterior do corpo vertebral) e D (processo articular siperior). A força de compressão produziu o afastamento dos pontos localizados nas regiões A e B, e aproximação dos pontos da região D. A força de distração produziu a aproximação dos pontos da região A e B e o afastamento dos pontos da região D.
Highlights
Pedicular fixation systems have been widely used in the scope of spine surgery, and its application is usually related to stabilization or correction of vertebral segment deformities
The objective of the study conducted was to check the effects of compression or distraction forces application on a vertebral fixation system using a pediculum as anchorage point, as well as the effects caused by such forces application to different portions of vertebral segment
Values for segment L2-L3 were not considered for distraction assays, pression or distraction forces on different segments used in the study, are described on Tables 1 and 2
Summary
Pedicular fixation systems have been widely used in the scope of spine surgery, and its application is usually related to stabilization or correction of vertebral segment deformities. During the application of that vertebral fixation modality, compression or distraction forces are applied on bars and screws of the fixation system. Due to vertebral segment’s morphology, the application of such forces is not homogeneously distributed on different parts of vertebral segment (anterior, medial, and posterior), being this the major purpose to conduct this study. The objective of the study conducted was to check the effects of compression or distraction forces application (approaching or deviation) on a vertebral fixation system using a pediculum as anchorage point, as well as the effects caused by such forces application to different portions of vertebral segment
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