Fig. 3From: Distribution of ossified spinal lesions in patients with severe ossification of the posterior longitudinal ligament and prediction of ossification at each segment based on the cervical OP index classification: a multicenter study (JOSL CT study)Logistic regression model showing a significant correlation between cervical OP index grade and prevalence of ossification of the posterior longitudinal ligament at different thoracic and lumbar spinal levelsBack to article page