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Adjacent Vertebral Fractures In The Lumbar And Thoracic Spine After Balloon Kyphoplasty: A Finite Element Analysis – Balloon Kyphoplasty

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The article discusses a study that mechanically verifies the accuracy of vertebral augmentation (AVA) scores using a finite element method (FEM) with precise material constants of balloon kyphoplasty (BKP) cement. The study analyzed representative cases with AVA scores of 1, 3, and 5 among patients who underwent BKP for vertebral body fractures. The FEM model created for the study included the injured vertebral body in each case and measured the amount of displacement for each load. The Young modulus of the BKP cement was calculated from actual measurements. The study found that the AVA scoring system was mechanically verified using accurate material constants of BKP cement, and suggests the need for further multicenter surveys and external validation for clinical implementation

Summarised by Mr Mo Akmal – Lead Spinal Surgeon
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Published article

The purpose of the present study was to mechanically verify after vertebral augmentation (AVA) scores using a finite element method (FEM) with accurate material constants of balloon kyphoplasty (BKP) cement. Representative cases with AVA scores of 1 (case 1), 3 (case 2), and 5 (case 3) among patients with vertebral body fractures who underwent BKP were analyzed. A FEM model consisting of 5 vertebral bodies was created, including the injured vertebral body in each case. The amount of displacement…

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Abstract The purpose of the present study was to mechanically verify after vertebral augmentation (AVA) scores using a finite element method (FEM) with accurate material constants of balloon kyphoplasty (BKP) cement. Representative cases with AVA scores of 1 (case 1), 3 (case 2), and 5 (case 3) among patients with vertebral body fractures who underwent,

Abstract

The purpose of the present study was to mechanically verify after vertebral augmentation (AVA) scores using a finite element method (FEM) with accurate material constants of balloon kyphoplasty (BKP) cement. Representative cases with AVA scores of 1 (case 1), 3 (case 2), and 5 (case 3) among patients with vertebral body fractures who underwent BKP were analyzed. A FEM model consisting of 5 vertebral bodies was created, including the injured vertebral body in each case. The amount of displacement for each load (up to 4000 N) between the upper and lower vertebral bodies of each model was measured. Young modulus of the BKP cement was calculated from actual measurements using the EZ-Test EZ-S (Shimadzu Corporation, Kyoto, Japan). In all cases, the number of shell elements (209,296-299,876), solid elements (1913,029-2417,671), and nodes (387,848-487,756) were similar, indicating that FEM modeling was comparable among the cases. Young modulus of BKP cement, calculated using EZ-Test EZ-S, was 572 MPa. Fractures were detected by compressive forces of 3300 N (upper) and 3300 N (lower), 3000 N (upper) and 3100 N (lower), and 1200 N (upper) and 1200 N (lower) in cases 1, 2, and 3, respectively. The AVA scoring system was mechanically verified using the accurate material constants of BKP cement. A multicenter survey and external validation are therefore required for the clinical implementation of the AVA score.

The London Spine Unit : the highest rated spinal hospital in UK

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Adjacent vertebral fractures in the lumbar and thoracic spine after balloon kyphoplasty: A finite element analysis

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Abstract The purpose of the present study was to mechanically verify after vertebral augmentation (AVA) scores using a finite element method (FEM) with accurate material constants of balloon kyphoplasty (BKP) cement. Representative cases with AVA scores of 1 (case 1), 3 (case 2), and 5 (case 3) among patients with vertebral body fractures who underwent

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