Gravity-induced torque and intravertebral rotation in idiopathic scoliosis

Spine
Clayton J AdamMark J Pearcy

Abstract

Biomechanical analysis. To investigate the relationship between gravity-induced torques acting on the scoliotic spine and rotation within the vertebrae. Vertebral rotation is an important aspect of spinal deformity in idiopathic scoliosis, associated with ribcage asymmetry. Although both lateral curvature and rotation seem to increase together in progressive scoliosis, the mechanisms driving vertebral rotation are not clearly established and it is not known whether lateral curvature precedes rotation, or vice versa. 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 torque profiles along the length of each spine because of head, neck, and torso weight. Vertebral rotations were then measured for the same patients using Aaro and Dahlborn's technique with reformatted computed tomography images. The gravity-induced torque curves were compared with rotation measurements to see whether gravity-induced torque is a likely contributor to intravertebral rotation in scoliosis. Gravity-induced torques as high as 7.5 Nm act on the spines of idiopathic scoliosis patients because of body weight...Continue Reading

References

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Citations

Jun 30, 2014·Clinical Biomechanics·Bethany E KeenanClayton J Adam
Jul 1, 2009·Bone·Clayton J Adam, Geoffrey N Askin
Dec 19, 2015·Scoliosis·Bethany E KeenanClayton Adam
Apr 17, 2016·Ultrasound in Medicine & Biology·Qian WangMan-Sang Wong
Apr 9, 2011·The Spine Journal : Official Journal of the North American Spine Society·Michiel M A JanssenRené M Castelein
Mar 29, 2020·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Juehan WangLimin Liu
Apr 19, 2021·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Fraser R LabromJ Paige Little

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