Biomechanical modeling and assessment of lumbar vertebral body tethering configurations.
Biomechanics
Cable tensioning
Lumbar scoliosis
Pediatric idiopathic scoliosis
Vertebral body tethering
Journal
Spine deformity
ISSN: 2212-1358
Titre abrégé: Spine Deform
Pays: England
ID NLM: 101603979
Informations de publication
Date de publication:
09 2023
09 2023
Historique:
received:
23
12
2022
accepted:
29
04
2023
medline:
15
8
2023
pubmed:
14
5
2023
entrez:
13
5
2023
Statut:
ppublish
Résumé
Vertebral body tethering (VBT) is a fusionless spinal growth modulation technique, which shows promise for pediatric idiopathic scoliosis (IS) curve correction. This technique, mainly used for thoracic curves, is increasingly being used to treat lumbar curves in order to preserve spine flexibility. It remains necessary to adequately define the cord tension to be applied during the operation and the instrumented levels to biomechanically predict correction over time for the lumbar spine. Twelve pediatric patients with lumbar IS, treated with lumbar-only or lumbar and thoracic VBT, were selected for this study. Three independent variables were tested alternately using a patient-specific finite element model (FEM), which includes an algorithm modeling vertebra growth and spine curve changes due to growth modulation for 24 months post-operatively according to the Hueter-Volkmann principle. Parameters included cable tensioning (150N/250N), upper instrumented level (actual UIV, UIV-1) and lower instrumented level (actual LIV, LIV + 1). Each FEM was personalized using 3D radiographic reconstruction and flexibility supine radiographs. An increase in cord tension (from 150 to 250N) had significant effects on main thoracic and thoraco-lumbar/lumbar Cobb angles, as well as on lumbar lordosis, after surgery (supplementary average correction of 3° and 8°, and increase of 1.4°, respectively) and after 24 months (4°, 10° and 1.1°) (p < 0.05). Adding a level to the actual UIV or LIV did not improve correction. This parametric study showed that cord tension is the most important biomechanical parameter on the simulated immediate and 2-year increase in lumbar curve correction. Our preliminary model suggests that it is not advantageous to add additional instrumented levels. This computational study uses a retrospective validation cohort (level of evidence 3).
Identifiants
pubmed: 37179281
doi: 10.1007/s43390-023-00697-8
pii: 10.1007/s43390-023-00697-8
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
1041-1048Informations de copyright
© 2023. The Author(s), under exclusive licence to Scoliosis Research Society.
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