FINITE ELEMENT ANALYSIS OF THORACOLUMBAR JUNCTION TRANSPEDICULAR FIXATION VARIANTS AFTER RESECTION OF THE TH12 VERTEBRA WHILE FORWARD BENDING

  2. 2023
  3. FINITE ELEMENT ANALYSIS OF THORACOLUMBAR JUNCTION TRANSPEDICULAR FIXATION VARIANTS AFTER RESECTION OF THE TH12 VERTEBRA WHILE FORWARD BENDING

Nekhlopochyn O. S., Verbov V. V., Cheshuk I. V., Karpinsky M. Yu., Yaresko O. V.

FINITE ELEMENT ANALYSIS OF THORACOLUMBAR JUNCTION TRANSPEDICULAR FIXATION VARIANTS AFTER RESECTION OF THE TH12 VERTEBRA WHILE FORWARD BENDING

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About the author:

Nekhlopochyn O. S., Verbov V. V., Cheshuk I. V., Karpinsky M. Yu., Yaresko O. V.

Heading:

CLINICAL AND EXPERIMENTAL MEDICINE

Type of article:

Scientific article

Annotation:

The zone of the thoracolumbar transition is one of the "most typical" areas of traumatic changes under the influence of mechanical stress on the human body. In modern clinical practice, many different types of surgical correction of traumatic injuries in this area are used, which ensure adequate decompression of the structures of the spinal canal, correct the axis of the spine and complete stabilization. Despite the achievements of modern medicine, these surgical interventions are characterized by a certain percentage of complications caused by the overloading of certain areas of the stabilization system or bone structures of fixed vertebrae. Therefore, one of the ways to solve this problem is to increase the reliability of fixation without increasing its length due to ensuring a uniform load. This study aimed to study the stress-strain state of the model of the lumbar spine after resection of the Th12 vertebra with various options for transpedicular fixation when the trunk is tilted forward. The task was implemented by developing a finite-element model of the thoracolumbar section of the human spine, simulating the condition after surgery for an explosive fracture of Th12 with existing interbody support and a transpedicular system consisting of 8 screws installed in the bodies of Th10, Th11, L1 and L2. The influence of different lengths of transpedicular screws and the presence of crosslinks on load distribution was studied. It was determined that when the trunk is tilted forward, the use of crosslinks reduces the stress level at all control points of the models, regardless of the length of the used fixing screws. At the same time, using long bicortical screws causes an increase in the stress level in the body of the T11 vertebra, around all the fixing screws and on the screws themselves. Using transpedicle screws with a standard depth of immersion and crosslinks appears to be the most biomechanically appropriate.

Tags:

crosslink, finite element model, forward bend, thoracolumbar transition, transpedicular stabilization

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Publication of the article:

«Bulletin of problems biology and medicine», 2023 Issue 2, 169, 281-296 pages, index UDC 616.711.5/.6-001-089.22

DOI:

10.29254/2077-4214-2023-2-169-281-296

2023 Issue 2, 169
crosslink finite element model forward bend thoracolumbar transition transpedicular stabilization
29.06.2023
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