| Local and global subaxial cervical spine biomechanics after single-level fusion or cervical arthroplasty. | |
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MedLine Citation:
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PMID: 19585159 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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An experimental in vitro biomechanical study was conducted on human cadaveric spines to evaluate the motion segment (C4-C5) and global subaxial cervical spine motion after placement of a cervical arthroplasty device (Altia TDI,Amedica, Salt Lake City, UT) as compared to both the intact spine and a single-level fusion. Six specimens (C2-C7) were tested in flexion/extension, lateral bending, and axial rotation under a +/- 1.5 Nm moment with a 100 N axial follower load. Following the intact spine was tested; the cervical arthroplasty device was implanted at C4-C5 and tested. Then, a fusion using lateral mass fixation and an anterior plate was simulated and tested. Stiffness and range of motion (ROM) data were calculated. The ROM of the C4-C5 motion segment with the arthroplasty device was similar to that of the intact spine in flexion/extension and slightly less in lateral bending and rotation, while the fusion construct allowed significantly less motion in all directions. The fusion construct caused broader effects of increasing motion in the remaining segments of the subaxial cervical spine, whereas the TDI did not alter the adjacent and remote motion segments. The fusion construct was also far stiffer in all motion planes than the intact motion segment and the TDI, while the artificial disc treated level was slightly stiffer than the intact segment. The Altia TDI allows for a magnitude of motion similar to that of the intact spine at the treated and adjacent levels in the in vitro setting. |
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Authors:
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Michael A Finn; Darrel S Brodke; Michael Daubs; Alpesh Patel; Kent N Bachus |
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Publication Detail:
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Type: Journal Article Date: 2009-07-08 |
Journal Detail:
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Title: European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society Volume: 18 ISSN: 1432-0932 ISO Abbreviation: Eur Spine J Publication Date: 2009 Oct |
Date Detail:
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Created Date: 2009-09-29 Completed Date: 2009-12-15 Revised Date: 2010-10-04 |
Medline Journal Info:
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Nlm Unique ID: 9301980 Medline TA: Eur Spine J Country: Germany |
Other Details:
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Languages: eng Pagination: 1520-7 Citation Subset: IM |
Affiliation:
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Department of Neurosurgery, University of Utah School of Medicine, Salt Lake City, UT, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Arthroplasty
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instrumentation,
methods* Biomechanics / physiology Cadaver Cervical Vertebrae / anatomy & histology, physiology*, surgery* Diskectomy / instrumentation, methods Humans Internal Fixators / standards Joint Instability / physiopathology, prevention & control, surgery Middle Aged Movement / physiology Prostheses and Implants / standards* Range of Motion, Articular / physiology Spinal Fusion / instrumentation*, methods Spondylosis / surgery* Stress, Mechanical Zygapophyseal Joint / physiology |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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