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TECHNICAL PAPERS: Bone/Orthopedics

Dynamic Characteristics of the Intact, Fused, and Prosthetic-Replaced Cervical Disk

[+] Author and Article Information
Michael C. Dahl1

Applied Biomechanics Laboratory, Department of Mechanical Engineering, University of Washington, Seattle, WA 98109micdahl@u.washington.edu

Jeffrey P. Rouleau

Cervical/Trauma Division,  Medtronic Sofamor Danek, Inc., 710 Medtronic Parkway, Minneapolis, MN 55432

Stephen Papadopoulos

 Barrow Neurosurgical Associates, 2910 N. 3rd Ave., Phoenix, AZ 85013

David J. Nuckley, Randal P. Ching

Applied Biomechanics Laboratory, Department of Mechanical Engineering, University of Washington, Seattle, WA 98109

1

Corresponding author.

J Biomech Eng 128(6), 809-814 (Apr 27, 2006) (6 pages) doi:10.1115/1.2354207 History: Received August 19, 2005; Revised April 27, 2006

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Diagram of the experimental setup, depicting (from top to bottom): MTS ram, Z-axis load cell, upper body mass, specimen, six-axis load cell

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Figure 2

Dynamic stiffness calculation using linear fit of loading and unloading cycle

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Figure 3

Mean and standard deviations of C5-C6 spinal level dynamic stiffnesses (400N, 10Hz, ∼31.4mm∕s). Fused construct demonstrates statistical significance over intact and implanted constructs.

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Figure 4

Implant load-displacement plots depicting hysteresis loops for increasing levels of impulse load (spec. No. 5, prosthetic)

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Figure 5

Mean and standard deviation of construct energy absorption for the three impact test levels (C5–C6 spinal level data)

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Figure 6

The implanted construct depicts an increase in regional energy absorption as a function of impulse load

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Figure 7

Superior to inferior load cell phase shift versus frequency Bode plot. Natural frequency is denoted by where phase curve crosses 90deg.

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Figure 8

Mean and standard deviation of viscous damping ratio (measured over total construct). The implanted constructs exhibited a higher damping ratio trend.

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