Document Detail

Congenital cervical block vertebrae are associated with caudally adjacent discs.
MedLine Citation:
PMID:  15964113     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Knowledge on the time course of changes in cervical disc height and cervical kinematics at motion segments adjacent to congenital block vertebrae is fragmentary. Compared with this, after surgical fusion of cervical spine segments some find increased degenerative processes in combination with hypermobility or instability while others were unable to confirm these changes. This cross sectional study was undertaken to investigate whether congenital block vertebrae are associated with an increased risk of disc degeneration and hypermobility at adjacent motion segments. METHODS: In 25 subjects (mean age 40 years) disc height, vertebral height and segmental mobility at motion segments adjacent to a congenital block vertebra were assessed quantitatively by distortion-compensated Roentgen analysis. The findings were compared to a normal database. FINDINGS: Height of the disc cranially adjacent to the block vertebra did not deviate from the norm while height of the caudally adjacent disc was significantly reduced. The height of the vertebrae adjacent to the block did not deviate from normal. The motion segments formed by the block vertebra and the adjacent discs and vertebrae exhibited no deviation from normal with respect to sagittal plane rotational or translational motion. INTERPRETATION: Congenital block vertebrae do not result in rotational or translational hyper- or hypomobility at motion segments adjacent to the block. Whether the observed, significant height reduction of the caudally adjacent disc is caused by degeneration following the block formation cannot undoubtedly be concluded as the initial state is not known. Further longitudinal studies are needed to investigate this issue.
Gunnar Leivseth; Wolfgang Frobin; Paul Brinckmann
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Publication Detail:
Type:  Clinical Trial; Journal Article    
Journal Detail:
Title:  Clinical biomechanics (Bristol, Avon)     Volume:  20     ISSN:  0268-0033     ISO Abbreviation:  Clin Biomech (Bristol, Avon)     Publication Date:  2005 Aug 
Date Detail:
Created Date:  2005-07-04     Completed Date:  2005-08-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8611877     Medline TA:  Clin Biomech (Bristol, Avon)     Country:  England    
Other Details:
Languages:  eng     Pagination:  669-74     Citation Subset:  IM    
Faculty of Medicine, Department of Neuromedicine, Norwegian University of Science and Technology, St. Olav University Hospital, P.O. Box 211, Olav Kyrresgt. 16, 7089 Trondheim, Norway.
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MeSH Terms
Cervical Vertebrae / abnormalities*,  physiopathology,  radiography*
Cohort Studies
Intervertebral Disk Displacement / etiology*,  physiopathology,  radiography*
Joint Instability / etiology,  physiopathology,  radiography
Middle Aged
Radiographic Image Interpretation, Computer-Assisted / methods*
Risk Assessment / methods
Risk Factors
Spinal Diseases / congenital*,  physiopathology,  radiography*

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