PubMed · 3354152
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M I Antoniuk. [Grisel's disease after tonsillectomy].. https://pubmed.ncbi.nlm.nih.gov/3354152/
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Sensation in the parasagittal occipital region is usually provided by fibres from the second cervical root via the greater occipital nerve. In the case presented occipital neuralgia could be relieved only by coagulation of the C1 nerve root with 96% ethyl alcohol. Possible explanations for this observation are discussed and a technique for CT-guided treatment is described.
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For the purpose of understanding the acute instability of a burst (Jefferson) fracture of the atlas, the authors produced the fractures experimentally and measured multidirectional flexibilities in seven cadaveric C0-C3 specimens. The flexibilities were measured by the authors' standardized method: they applied six types of physiologically pure moments (up to 1.5 Nm) and recorded the ensuing C0-C2 motions by stereophotogrammetry. The flexibility tests were performed before and after the production of the fracture. The greatest increase in flexibility due to the injury was in flexion-extension (+22.0 degrees, 41.7%). In lateral bending, the increase was 7.7 degrees, or 23.9%. The flexibility was mostly maintained in axial rotation (+4.8 degrees, 5.4%). The increase in motion was due to an increase in neutral zone in flexion-extension, and an increase in the elastic zone in lateral bending. These flexibility results of experimentally produced fractures reflect quite well the acute instabilities seen clinically.