Document Detail

New method for determining apparent axial center of rotation of lumbar and thoracic spine segments.
MedLine Citation:
PMID:  21674408     Owner:  NLM     Status:  In-Data-Review    
One main question in spinal kinematics is the determination of the spine's apparent axial center of rotation. Previous research on this topic has yielded contradictory results. The objective of this study was to determine the apparent axial center of rotation for seven lumbar and six thoracic spinal segments by developing and validating a new method. A custom six-degree-of-freedom device, allowing full range of motion, was used with motion recording and analysis software. This system tracked a grid of markers on a specimen when rotational torque was applied in both clockwise and counterclock wise directions at 3.53 Nm, 7.05 Nm, 10.58 Nm, and 14.10 Nm. The area encompassing the apparent axial center of rotation was determined by identifying the five markers with the least amount of motion. The marker angular displacement was calculated as the angle between a virtual line drawn between two points in the initial and final torque conditions. Rotation in both directions was averaged. The lumbar and thoracic spinal segments averaged an apparent axial center of rotation at the posterior border of the vertebral endplates and the anterior border of the spinal canal, with average clockwise to counterclockwise angular displacement ratios of 0.87 and 0.97, respectively.
Sanjum P Samagh; Charles D Rosen; Karimdad Otarodifard; Matthew Kornswiet; Gabe Palmer; Thay Q Lee
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of rehabilitation research and development     Volume:  48     ISSN:  1938-1352     ISO Abbreviation:  J Rehabil Res Dev     Publication Date:  2011  
Date Detail:
Created Date:  2011-06-15     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8410047     Medline TA:  J Rehabil Res Dev     Country:  United States    
Other Details:
Languages:  eng     Pagination:  587-96     Citation Subset:  IM    
Orthopaedic Biomechanics Laboratory, Department of Veterans Affairs Long Beach Healthcare System, Long Beach, CA.
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