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Patient-specific computational biomechanics for simulating adolescent scoliosis surgery : predicted vs clinical correction for a preliminary series of six patients

Little, J. Paige & Adam, Clayton J. (2010) Patient-specific computational biomechanics for simulating adolescent scoliosis surgery : predicted vs clinical correction for a preliminary series of six patients. International Journal for Numerical Methods in Biomedical Engineering, 27(3), 347 -356.

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Abstract

Scoliosis is a spinal deformity that requires surgical correction in progressive cases. In order to optimize surgical outcomes, patient-specific finite element models are being developed by our group. In this paper, a single rod anterior correction procedure is simulated for a group of six scoliosis patients. For each patient, personalised model geometry was derived from low-dose CT scans, and clinically measured intra-operative corrective forces were applied. However, tissue material properties were not patient-specific, being derived from existing literature. Clinically, the patient group had a mean initial Cobb angle of 47.3 degrees, which was corrected to 17.5 degrees after surgery. The mean simulated post-operative Cobb angle for the group was 18.1 degrees. Although this represents good agreement between clinical and simulated corrections, the discrepancy between clinical and simulated Cobb angle for individual patients varied between -10.3 and +8.6 degrees, with only three of the six patients matching the clinical result to within accepted Cobb measurement error of +-5 degrees. The results of this study suggest that spinal tissue material properties play an important role in governing the correction obtained during surgery, and that patient-specific modelling approaches must address the question of how to prescribe patient-specific soft tissue properties for spine surgery simulation.

Impact and interest:

4 citations in Scopus
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2 citations in Web of Science®

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ID Code: 41000
Item Type: Journal Article
Keywords: Scoliosis, Finite Element, Computational Biomechanics, Surgical Planning, Spinal Deformity
DOI: 10.1002/cnm.1422
ISSN: 2040-7939
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > BIOMEDICAL ENGINEERING (090300) > Biomechanical Engineering (090302)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > BIOMEDICAL ENGINEERING (090300) > Biomedical Engineering not elsewhere classified (090399)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Current > Schools > School of Economics & Finance
Past > Schools > School of Engineering Systems
Copyright Owner: Copyright 2010 John Wiley & Sons, Ltd.
Deposited On: 07 Apr 2011 07:58
Last Modified: 10 Apr 2011 07:44

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