Journal of spinal disorders & techniques
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J Spinal Disord Tech · Feb 2008
Vertical atlantoaxial index: a new craniovertebral radiographic index.
An index for measuring the vertical relationship of atlas and axis is described. ⋯ VAAI can be an excellent measurement tool for the assessment of relationship of atlas and axis. Nonrheumatoid BI can be graded and classified depending on the value of VAAI.