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Gravity-Induced Torsion and Intravertebral Rotation in Idiopathic Scoliosis

Adam, Clayton J., Pearcy, Mark J., & Askin, Geoffrey N. (2008) Gravity-Induced Torsion and Intravertebral Rotation in Idiopathic Scoliosis. In Raghunath, Michael & Toh, Siew Lok (Eds.) The 13th International Conference on Biomedical Engineering, 7 - 10 December, 2008, Suntec Singapore International Convention and Exhibition Centre, Singapore.

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Abstract

Vertebral rotation is an important aspect of spinal deformity in idiopathic scoliosis, associated with ribcage asymmetry. This paper investigates the hypothesis that intravertebral (within the bone) rotation in idiopathic scoliosis is caused by growth in the presence of gravity-induced torsions. Three dimensional spinal curvature was measured for a small group of idiopathic scoliosis patients using standing radiographs, and equations of static equilibrium were used to calculate gravity-induced torsion profiles along the length of each spine. Intravertebral rotations were then measured for the same patients using Aaro & Dahlborn’s technique with reformatted computed tomography images. Torsion curves were compared with rotation measurements to see whether gravity-induced torsion is a likely contributor to intravertebral rotation in scoliosis. Results showed gravity-induced torques as high as 7.5Nm acting on the spines of idiopathic scoliosis patients due to static body weight in the standing position, and maximum intravertebral rotations (for a single vertebra) of approximately 7. General agreement exists between measured intravertebral rotations and profiles of gravity-induced torsion along the length of the spine. Gravity-induced torsion is therefore a potential cause of vertebral rotation in idiopathic scoliosis.

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ID Code: 17301
Item Type: Conference Paper
Keywords: spinal deformity, vertebral rotation, gravity-induced torque, scoliotic spine, idiopathic scoliosis
ISBN: 981054572X
ISSN: 1727-1983
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > BIOMEDICAL ENGINEERING (090300) > Biomechanical Engineering (090302)
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > CLINICAL SCIENCES (110300) > Orthopaedics (110314)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
Past > Schools > School of Engineering Systems
Copyright Owner: Copyright 2008 [please consult the authors]
Copyright Statement: Authors retain all proprietary rights in any process, procedure, or article of manufacture described in the work.
Deposited On: 06 Feb 2009 08:52
Last Modified: 03 Mar 2011 15:46

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