What causes thickening of the posterior longitudinal ligament?
Mizuno et al3 considered that HPLL might be a result of the process of PLL degeneration without ossification, which is caused by the metaplasia from collagenous fibers of ligament to chondrocytes.
Why anterior longitudinal ligament is stronger than posterior longitudinal ligament?
While anteriorly the ligament is thin due to the elastic fibers, the posterior capsule of each posterior joint is thicker due to the collagenous content.
How are anterior and posterior longitudinal ligaments different?
The anterior and posterior longitudinal ligament is relatively thin, the posterior longitudinal ligament has toughness, and the anterior longitudinal ligament is relatively weak [ 5 ]. Under physiological load, the position of each vertebral body is normal, the nerve root injury or stimulation, deformity or pain will not happen.
Which is the normal ligament on MR imaging?
The normal tectorial membrane and transverse ligament are routinely seen on MR imaging, whereas the normal alar ligaments can be more difficult to visualize because of lack of contrast from adjacent tissues (Fig. 3).
Is there ossification of the posterior longitudinal ligament ( OPLL )?
Ossification of the posterior longitudinal ligament (OPLL) is typically an entity seen in patients of Asian descent, although it is seen in all ethnic groups. It is characterized by, as the name suggests, ossification of the posterior longitudinal ligament. Article: Epidemiology.
When do you need an anterior and posterior MRI?
Lower cervical anterior and posterior longitudinal ligament injury. When the cervical spine injury is particularly severe, the clinical manifestations of the patients are coma, vague awareness, unclear expression, severe pain, unable to move and other similar symptoms, it is necessary to carry out MRI detection.