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Biomechanics of vertebral compression fractures and clinical application

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Abstract

Local biomechanical factors in the etiology of vertebral compression fractures are reviewed. The vertebral body is particularly vulnerable to compression fracture when its bone mineral density (BMD) falls with age. However, the risk of fracture, and the type of fracture produced, does not depend simply on BMD. Equally important is the state of degeneration of the adjacent intervertebral discs, which largely determines how compressive forces are distributed over the vertebral body. Disc height also influences load-sharing between the vertebral body and neural arch, and hence by Wolff’s Law can influence regional variations in trabecular density within the vertebral body. Vertebral deformity is not entirely attributable to trauma: it can result from the gradual accumulation of fatigue damage, and can progress by a quasi-continuous process of “creep”. Cement injection techniques such as vertebroplasty and kyphoplasty are valuable in the treatment of these fractures. Both techniques can stiffen a fractured vertebral body, and kyphoplasty may contribute towards restoring its height. The presence of cement can limit endplate deformation, and thereby partially reverse the adverse changes in load-sharing which follow vertebral fracture. Cement also reduces time-dependent “creep” deformation of damaged vertebrae.

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The authors declare that they have no conflict of interest.

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  1. Centre for Comparative and Clinical Anatomy, University of Bristol, Southwell Street, Bristol, BS2 8EJ, UK

    Michael A. Adams & Patricia Dolan

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  1. Michael A. Adams
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  2. Patricia Dolan
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Correspondence to Michael A. Adams.

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Adams, M.A., Dolan, P. Biomechanics of vertebral compression fractures and clinical application. Arch Orthop Trauma Surg 131, 1703–1710 (2011). https://doi.org/10.1007/s00402-011-1355-9

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