Table 4. Effects of radiological parameters on JOA score.

Multiple regression testing was performed to analyze correlation between se, age, C2–7 SVA, C2–7 Cobb angle, no. of OPLL involved, occupying ratio, compression angle, SI change on MRI and JOA score. SE : standard error of the means, JOA : Japanese Orthopedic Association, SVA : sagittal vertical axis, OPLL : ossification of the posterior longitudinal ligament, SI : signal intensity