Fig 1.
66-year-old man with neck pain and mobility disturbance after trauma.
(A) The sagittal reconstructed CT image revealed ossification of the posterior longitudinal ligament extending from C1 to C5 and measuring 8.1cm along its entire length. (B) Another CT image showed ossification of the nuchal ligament extending from C4 to C5 and measuring 1.4cm along its entire length.
Fig 2.
70-year-old man with neck pain after fall down.
(A) Lateral radiograph of the cervical spine showing a linear increased density on the posterior surface of the vertebral bodies (short arrow) and ossification of the nuchal ligament (long arrow). (B) The sagittal reconstructed CT image revealed ossification of the posterior longitudinal ligament (long double arrow) and nuchal ligament (short double arrow).
Fig 3.
60-year-old man with neck discomfort and mobility disturbance after trauma.
(A) Lateral radiograph of the cervical spine showing ossification of the nuchal ligament (arrow). However, ossification of the posterior longitudinal ligament was not clearly visible. (B) The sagittal reconstructed CT image revealed ossification of the nuchal ligament extending from C4 to C5 and measuring 2.9cm along its entire length. (C) Another CT slice showing ossification of the posterior longitudinal ligament extending from C4 to C6 and measuring 3.8cm along its entire length.
Table 1.
Incidence of OPLL and ONL.
Table 2.
Mean length of OPLL and ONL (mm).
Table 3.
Pearson correlation coefficients (CCs) between the length of ONL and the presence of OPLL and between the length of ONL and length of OPLL.