Fig. 4From: Prognostic factors for surgical outcome in spinal cord injury associated with ossification of the posterior longitudinal ligament (OPLL)Signal intensity grade. Signal intensity of the spinal cord was assessed as grade 0—no change in signal intensity (SI) on T2-weighted MR images; grade 1—light intensity change; and grade 2—bright signal, clearly distinguishable from that of grade 1Back to article page