There is currently no universal model or fitting method to characterize the visco-elastic behavior of the lumbar spine observed in displacement versus load hysteresis loops. In this study, proposed methods for fitting these loops, along with the metrics obtained, were thoroughly analyzed. A spline fitting technique was shown to provide a consistent approximation of spinal kinetic behavior that can be differentiated and integrated. Using this tool, previously established metrics were analyzed using data from two separate studies evaluating different motion preservation technologies. Many of the metrics, however, provided no significant differences beyond range of motion analysis. Particular attention was paid to how different definitions of the neutral zone capture the high-flexibility region often seen in lumbar hysteresis loops. As a result, the maximum slope was introduced and shown to be well defined. This new parameter offers promise as a descriptive measurement of spinal instability in vitro and may have future implications in clinical diagnosis and treatment of spinal instability. In particular, it could help in assigning treatments to specific stabilizing effects in the lumbar spine.
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August 2014
Research-Article
Quantitative Analysis of the Nonlinear Displacement–Load Behavior of the Lumbar Spine
Andrew D. Hanlon,
Andrew D. Hanlon
Department of Neurosurgery,
Pittsburgh, PA 15212
Allegheny General Hospital
,420 East North Avenue
,Pittsburgh, PA 15212
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Daniel J. Cook,
Daniel J. Cook
Department of Neurosurgery,
Pittsburgh, PA 15212
Allegheny General Hospital
,420 East North Avenue
,Pittsburgh, PA 15212
Search for other works by this author on:
Matthew S. Yeager,
Matthew S. Yeager
Department of Neurosurgery,
Pittsburgh, PA 15212
Allegheny General Hospital
,420 East North Avenue
,Pittsburgh, PA 15212
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Boyle C. Cheng
Boyle C. Cheng
1
Department of Neurosurgery,
Pittsburgh, PA 15212
e-mail: boylecheng@yahoo.com
Allegheny General Hospital
,420 East North Avenue
,Pittsburgh, PA 15212
e-mail: boylecheng@yahoo.com
1Corresponding author.
Search for other works by this author on:
Andrew D. Hanlon
Department of Neurosurgery,
Pittsburgh, PA 15212
Allegheny General Hospital
,420 East North Avenue
,Pittsburgh, PA 15212
Daniel J. Cook
Department of Neurosurgery,
Pittsburgh, PA 15212
Allegheny General Hospital
,420 East North Avenue
,Pittsburgh, PA 15212
Matthew S. Yeager
Department of Neurosurgery,
Pittsburgh, PA 15212
Allegheny General Hospital
,420 East North Avenue
,Pittsburgh, PA 15212
Boyle C. Cheng
Department of Neurosurgery,
Pittsburgh, PA 15212
e-mail: boylecheng@yahoo.com
Allegheny General Hospital
,420 East North Avenue
,Pittsburgh, PA 15212
e-mail: boylecheng@yahoo.com
1Corresponding author.
Manuscript received July 11, 2013; final manuscript received May 22, 2014; accepted manuscript posted May 29, 2014; published online June 11, 2014. Assoc. Editor: Brian D. Stemper.
J Biomech Eng. Aug 2014, 136(8): 081009 (7 pages)
Published Online: June 11, 2014
Article history
Received:
July 11, 2013
Revision Received:
May 22, 2014
Accepted:
May 29, 2014
Citation
Hanlon, A. D., Cook, D. J., Yeager, M. S., and Cheng, B. C. (June 11, 2014). "Quantitative Analysis of the Nonlinear Displacement–Load Behavior of the Lumbar Spine." ASME. J Biomech Eng. August 2014; 136(8): 081009. https://doi.org/10.1115/1.4027754
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