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Our study aims to introduce a dynamic interval ratio method calculated using cervical hyperextension-flexion X-ray films. Secondarily, we aim to evaluate the relationship between the posterior atlanto-occipital interval ratio and cervical spondylotic myelopathy and explain the rationale.

quantitative imaging in medicine and surgery

The ratio of the posterior atlanto-occipital interval (PAOI): a novel radiographic ratio method evaluating the risk of cervical spondylotic myelopathy—a case-control study