Progression of cervical ossification of the posterior longitudinal ligament (OPLL) is associated with younger age, involvement of multiple levels, and mixed-type morphology. OPLL masses that are contiguous with the vertebral body and have trabecular formation are useful findings for identifying masses that are less likely to progress 1).
Although posterior decompressive surgery is widely used to treat patients with cervical myelopathy and multilevel ossification of the posterior longitudinal ligament (OPLL), a poor outcome is anticipated if the sagittal alignment is kyphotic (or K-line negative).
There were no differences in clinical outcome according to surgical type, but complication rates varied depending on sex and surgical approach to symptom 2).