Fig. 2From: 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)Hazard ratios for the prevalence of ossified lesions at each spinal level in patients with severe OPLL compared with patients with OPLL of any grade. OPLL, ossification of the posterior longitudinal ligamentBack to article page