Finite element analysis of the indirect reduction of posterior pedicle screw fixation for a thoracolumbar burst fracture

This study uses computer modeling to understand how posterior pedicle screw fixation helps in treating thoracolumbar burst fractures. The researchers simulated the fracture reduction process to observe changes in the spine's components. The model was used to simulate the spine being put back into its normal shape through extension and distraction. The displacement and stress were observed in the intervertebral disc, fractured vertebral body and posterior longitudinal ligament. The study found that extension helps restore the spine's normal height and shape, while distraction helps to push bone fragments back into place. These findings enhance the understanding of the biomechanics of indirect reduction.

• 1
  Extension (positional reduction) helps restore the normal height and kyphosis of the injured vertebrae, concentrating stress on the upper disc.
• 2
  Distraction aids in reducing the posterior longitudinal ligament, which can then push bone fragments in the spinal canal into the reset space.
• 3
  The intervertebral disc plays an important role in reducing vertebral body height and wedge angle, while the posterior longitudinal ligament pushes bone fragments into the created space.