Vertical atlantoaxial index: a new craniovertebral radiographic index

Journal of Spinal Disorders & Techniques
Arvind G Kulkarni, Atul H Goel

Abstract

An index for measuring the vertical relationship of atlas and axis is described. Deduction and application of vertical atlantoaxial index (VAAI) for quantifying the vertical atlantoaxial relationship of atlas and axis and classifying basilar invagination (BI) based on the VAAI. A number of craniospinal parameters have been described to quantify the amount of BI in relation to herniation of odontoid into the cranium. Successful treatment of BI by distraction of atlantoaxial facet joint, placement of a spacer to maintain the distraction, and lateral mass fixation has been described recently. The treatment is based on the understanding that BI is in fact a disease of the atlantoaxial facet joints and is a result of progressive vertical instability. With this new concept and technique that involves preserving all bony elements and reduction of BI in the form of reducing the vertical atlantoaxial subluxation, we thought it was prudent to formulate an index to quantify the relation of atlas and axis in the sagittal plane. Mid-sagittal computerized tomography (CT) scan films of 90 cases of BI treated by us between October 1999 and May 2005 with distraction and lateral mass plate and screw fixation were analyzed before and after surger...Continue Reading

References

May 1, 1986·Spine·R N Hensinger
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Citations

Aug 5, 2009·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·Shenglin WangHaitao Zhou
Jul 11, 2013·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·M L PissonnierM A Rousseau
Jul 3, 2009·Journal of Neurosurgery. Spine·Atul GoelSanjay Rajan
Aug 23, 2011·Journal of Neurosurgery. Spine·Pravin SalunkeNiranjan K Khandelwal
Oct 19, 2013·Clinical Spine Surgery : a Spine Publication·Yutaka SasaoHaruhito Aoki
Feb 25, 2020·Journal of Craniovertebral Junction and Spine·Ibrahim HussainAli A Baaj
Nov 17, 2016·British Journal of Neurosurgery·Vittorio M RussoAdrian T H Casey
Aug 10, 2011·Physical Medicine and Rehabilitation Clinics of North America·David E FishVictoria Lin

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