Fig. 2

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 ligament
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 ligament