Segmental motion at the peak of the ossification foci is independent risk factor except for mal-alignment and thick ossification foci for poor outcome after laminoplasty for cervical ossification of the posterior longitudinal ligament: analyses in patients with positive K-line, lordotic alignment, and lower canal occupying ratio

Table 2 Imaging analyses

Imaging analyses
Type of ossification of the posterior longitudinal ligament (OPLL)
Continuous	1 case
Mixed	39 cases
Segmental	27 cases
Local	5 cases
Maximum occupation ratio (%)	44.7 ± 11.8
Pre-op. C2-7 angle (degree)	11.5 ± 8.8
Pre-op. segmental range of motion (ROM) at peak of OPLL (degree)	5.2 ± 3.9

ISSN: 1749-799X