From the external occipital protuberance to the waist, there is a supraspinous ligament connecting behind the spinous processes, with long fibers. Generally, it is manifested as a thick and thick nuchal ligament, which plays an important role in the stability of the occipital neck; in the thoracic segment, the supraspinous ligament is relatively weak; while the supraspinous ligament of the waist is also strong, but in the waist5~Sacrum1is often absent or relatively weak, which is prone to cause injury to the deep inter spinous ligament.