Dynamic stiffness and damping of human intervertebral disc using axial oscillatory displacement under a free mass system

The aim of this study was to analyse the dynamic response of the human intervertebral disc to vibration in a physiologically relevant frequency spectrum. Eight lumbar intervertebral discs were harvested. After preparation, each sample was subjected to a pre-loading and then dynamic compression (from...

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Bibliographic Details
Published in:European spine journal 2003-12, Vol.12 (6), p.562-566
Main Authors: Izambert, O, Mitton, D, Thourot, M, Lavaste, F
Format: Article
Language:English
Subjects:
Aged
Back Injuries - etiology
Back Injuries - physiopathology
Elasticity
Female
Humans
Intervertebral Disc - anatomy & histology
Intervertebral Disc - physiology
Intervertebral Disc - physiopathology
Low Back Pain - etiology
Low Back Pain - physiopathology
Lumbar Vertebrae - anatomy & histology
Lumbar Vertebrae - physiology
Lumbar Vertebrae - physiopathology
Male
Middle Aged
Models, Biological
Original
Posture - physiology
Stress, Mechanical
Weight-Bearing - physiology
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Summary:The aim of this study was to analyse the dynamic response of the human intervertebral disc to vibration in a physiologically relevant frequency spectrum. Eight lumbar intervertebral discs were harvested. After preparation, each sample was subjected to a pre-loading and then dynamic compression (from 5 to 30 Hz). The dynamic compression was applied using an experimental set-up comprising a free weight loading from above and a driving oscillatory displacement from below (closest to the in vivo loading). A viscoelastic model enabled the calculation of stiffness and damping from the transfer function. From 5 Hz to 30 Hz the stiffness values are between 0.19 and 3.66 (MN/m) and the damping values between 32 and 2094 (Ns/m). The mean resonant frequency was found at 8.7 Hz. These dynamic characteristics of the intervertebral disc could be used in a three-dimensional finite elements model of the human body to study its response to vibration in the driving position.
ISSN:0940-6719
1432-0932
DOI:10.1007/s00586-003-0569-0