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Exploration for reliable radiographic assessment method for hinge-like hypermobility at atlanto-occipital joint.
- Source :
-
European Spine Journal . Jun2018, Vol. 27 Issue 6, p1303-1308. 6p. 1 Black and White Photograph, 5 Charts. - Publication Year :
- 2018
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Abstract
- <bold>Purpose: </bold>Hinge-like hyper-mobility is occasionally observed at the atlanto-occipital (O-C1) joint. However, it has not been clear if this kind of hinge-like hyper-mobility at the O-C1 joint should be regarded as "pathologic", or referred to as "instability". To solve this issue, we aimed to establish a reliable radiographic assessment method for this specific type of O-C1 instability and figure out the "standard value" for the range of motion (ROM) of the O-C1 joint.<bold>Methods: </bold>To figure out the standard range of the O-C1 angle, we acquired magnetic resonance imaging (MRI) sagittal views of the cervical spine for 157 healthy volunteers [average: 37.4 year-old (yo)] without spine diseases, at neutral, maximum flexion and maximum extension positions.<bold>Results: </bold>The average value (AVE) for ROM of O-C1 angle was 9.91°. The standard value for ROM of O-C1 angle was calculated as 0°-21°. There was no statistically significant gender difference. We also found that the older population (≧ 40 yo) significantly had a larger ROM of O-C1 angle (AVE: 11.72°) compared to the younger population (< 40 yo) (AVE: 8.99°).<bold>Conclusions: </bold>We consider that hinge-like instability at O-C1 joint, which cannot be assessed by measuring Powers ratio, can be assessed by measuring the range of O-C1 angles using dynamic-MRI. Evaluation of O-C1 instability is important especially when we perform surgical treatment for diseases with upper cervical instability (such as retro-odontoid pseudotumor). We consider that the current study provides important information in such a case. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09406719
- Volume :
- 27
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- European Spine Journal
- Publication Type :
- Academic Journal
- Accession number :
- 129833946
- Full Text :
- https://doi.org/10.1007/s00586-017-5349-3