Figure 1

Flowchart of patients through the study. OPLL: ossification of the posterior longitudinal ligament; JOA score: Japanese Orthopedic Association score; MCID: minimum clinically important difference.
Flowchart of patients through the study. OPLL: ossification of the posterior longitudinal ligament; JOA score: Japanese Orthopedic Association score; MCID: minimum clinically important difference.