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TECHNICAL PAPERS

In Vitro Measurements of Porcine Anterior Column Units Under Free Swelling

[+] Author and Article Information
David A. Reiter, Nesrin Sarigul-Klijn

Department of Mechanical and Aeronautical Engineering, University of California, Davis, CA

Munish C. Gupta

Orthopedic Research Laboratory, UCDMC, University of California, Davis, CA

Fadi A. Fathallah

Department of Biological and Agricultural Engineering, University of California, Davis, CA

J Biomech Eng 125(6), 875-880 (Jan 09, 2004) (6 pages) doi:10.1115/1.1634283 History: Received August 20, 2002; Revised June 10, 2003; Online January 09, 2004
Copyright © 2003 by ASME
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References

Figures

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Cross-section of the alignment fixture for molding ACUs in PMMA
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Photo test setup with molded specimen and optical markers
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Radiograph with labeled bony reference features. The white line marks the slice used to measure intensity distribution through the intervertebral disc.
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Example of centroid of intensity calculation for radiographic data analysis. The gray region signifies the distribution of light intensity through a lateral IVD radiograph. X̄ is the distance of the center of intensity from the anterior edge of the IVD, x is the distance of the differential area from the anterior edge of the IVD, and y*dx is the intensity value multiplied by its respective differential length.
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Average angle vs. time for all specimens swelling in (a) flexion (n=9) and (b) extension (n=4). Error bars represent ± one standard deviation for specimens swelling in flexion and extension.

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