Título principal
A numerical analysis of the biomechanics of the troracolumbar spine and the effects of vertebral body tethering instrumentation [recurso eletrônico] / Rafael Carreira Oliveira ; orientador, Eduardo Alberto Fancello ; coorientador, Luis Fernando Nicolini ; coorientador, Rodrigo de M, Roesler
Data de publicação
2024
Descrição física
139 p. : il.
Nota
Disponível somente em versão on-line.
Dissertação (mestrado) – Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Mecânica, Florianópolis, 2024.
Inclui referências.
A numerical analysis of the biomechanics of the troracolumbar spine and the effects of vertebral body tethering instrumentation [recurso eletrônico] / Rafael Carreira Oliveira ; orientador, Eduardo Alberto Fancello ; coorientador, Luis Fernando Nicolini ; coorientador, Rodrigo de M, Roesler
Data de publicação
2024
Descrição física
139 p. : il.
Nota
Disponível somente em versão on-line.
Dissertação (mestrado) – Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Mecânica, Florianópolis, 2024.
Inclui referências.
Abstract: Vertebral Body Tethering (VBT) is an emerging surgical technique for the treatment of adolescent idiopathic scoliosis that has gained popularity among surgeons in recent years. Due to its relative novelty, many aspects related to the biomechanics of the instrumented spine remain unknown, and the rate of adverse events, including tether breakage, is high. The balance between scoliosis curve correction and the preservation of the patient’s spinal mobility is a crucial factor to be considered in surgical planning. This study aims to calibrate and validate a finite element model of the thoracolumbar spine (T10-S1) and conduct a case study to evaluate the effects of different pre-tension configurations of a VBT system on spinal biomechanics. The model was calibrated and validated based on experimental data from in vitro tests. The VBT system was incorporated into the model, which was subjected to flexion, extension, lateral bending, and axial rotation with a magnitude of 5 Nm. The results indicate that postoperative correction and the range of motion of the instrumented spine are, respectively, directly and inversely proportional to the tension in the tethers. Furthermore, the introduction of VBT in the spine generated significant unnatural coupled motion that may influence patient rehabilitation, which should be carefully considered by physiotherapists in the postoperative process. The forces developed in the tethers during the analyzed movement are significantly lower than those required to cause static failure, suggesting that other mechanisms of tether breakage must be present, requiring further studies.