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Research Papers

Investigation of the Intervertebral Disc and Fused Joint Dynamics Through Experimental Modal Analysis and the Receptance Coupling Method

[+] Author and Article Information
M. Malekian, D. Trieu, J. S. Owoc, S. S. Park

Department of Mechanical and Manufacturing Engineering, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada

C. J. Hunter

Department of Mechanical and Manufacturing Engineering, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada; Centre for Bioengineering Research and Education, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada

J Biomech Eng 132(4), 041004 (Mar 17, 2010) (13 pages) doi:10.1115/1.4001114 History: Received August 16, 2009; Revised January 25, 2010; Posted January 27, 2010; Published March 17, 2010; Online March 17, 2010

Identification of intervertebral disc (IVD) dynamics is important in understanding the spine mechanism and behavior. This paper experimentally identifies the dynamics of the bovine caudal IVD using experimental modal analysis and the inverse receptance coupling method. Experimental modal analysis was performed on free-free mounted bovine caudal vertebrae joined by an IVD and a fused IVD joint. Shear, rotational, and axial dynamics of the joints are identified by curve fitting of the frequency response functions, and identifying the damping ratio, stiffness, and modal frequency in each axis. The identified dynamics are compared with the IVD joints with and without fusion. Results provide important insight into IVD dynamics and fused IVD dynamics. This method can be extended to identify human IVD joint dynamics.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Overview of the joint identification

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Figure 2

Experimental modal test setup

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Figure 3

Bovine sample preparations: (a) tested intact (accelerometer mounts marked with dark dots), (b) fused, and (c) separated to test the individual vertebrae

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Figure 4

Receptance coupling of the two substructures

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Figure 5

Measuring the rotational dynamics

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Figure 6

Axial receptance coupling of the two substructures

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Figure 7

Translational IVD joint dynamics without and with fusion

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Figure 8

Rotational IVD joint dynamics without and with fusion

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Figure 9

Axial IVD joint dynamics without and with fusion

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Figure 10

Comparing the relationship between the natural frequency at different modes (ωn) and their corresponding stiffness (k) in fused and unfused samples

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Figure 11

Bone-IVD assembly with fixed-free conditions

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Figure 12

FRFs of the bone-IVD assembly with fixed-free conditions: (a) translational, (b) rotational, and (c) axial

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