| A continuous description of intervertebral motion by means of spline interpolation of kinematic data extracted by videofluoroscopy. | |
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MedLine Citation:
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PMID: 22277152 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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In vivo analysis of intervertebral kinematics provides useful information about spinal disorders and performance of disk prostheses. Diagnosis of intervertebral instability is based on measurement of abnormal range of segmental motion in sagittal plane through functional flexion-extension radiography; however, this concise measure does not take into account the progression of segmental motion in between flexion and extension extremes. Fluoroscopy can support analysis of intervertebral kinematics during patient's motion with an acceptable X-ray dose. A spline-based method designed for a continuous-time description of intervertebral motion extracted by videofluoroscopy is proposed. Fluoroscopic sagittal sequences of lumbar spine were processed by an automated method based on template matching to track vertebrae. A smoothing spline interpolation of the estimated intervertebral kinematic data was performed and a continuous-time description of segmental rotation and translation was obtained; the smoothing parameter was chosen both to preserve motion and to reduce noise. Concise measurements were extracted by the continuous-time kinematics and compared with standard clinical measurements of intervertebral sagittal rotation and translation. The trajectory of instantaneous center of rotation, never presented before for in vivo spinal segments, was provided and compared with standard measurements of the finite center of rotation. Results showed a good agreement with standard clinical measurements: on average, absolute differences resulted 0.74degree for sagittal rotation, 0.59mm for translation and 1.02mm for the x- and y-position of center of rotation. The proposed method offers an effective technique for the continuous-time description of intervertebral motion, maintaining standard clinical measurements for diagnosis of lumbar instability. |
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Authors:
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Paolo Bifulco; Mario Cesarelli; Tommaso Cerciello; Maria Romano |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-1-23 |
Journal Detail:
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Title: Journal of biomechanics Volume: - ISSN: 1873-2380 ISO Abbreviation: - Publication Date: 2012 Jan |
Date Detail:
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Created Date: 2012-1-26 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0157375 Medline TA: J Biomech Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2012 Elsevier Ltd. All rights reserved. |
Affiliation:
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Department of Biomedical, Electronic and Telecommunication Engineering, University "Federico II" of Naples, Via Claudio 21, 80125 Napoli, Italy. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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