From September 1997 to March 1999, 28 cases of anterior decompression interbody fusion for cervical spondylolisthesis were performed, among which 17 cases of mixed cervical spondylolisthesis mainly of spinal type with a total of 35 hooked vertebral joints were removed, as reported below: 1. The average age was 58.5 years (38-65 years). There were 8 cases with gradual or insidious onset; 4 cases with history of trauma; 3 cases with onset after exertion; 12 cases with history of dizziness, headache and vertigo, 6 cases with history of sudden collapse; 16 cases with numbness and pain in one or both shoulders and arms; 6 cases with severe pain, 2 cases with incomplete paralysis of limbs; 5 cases with weak hand grip, unstable gait and difficulty in self-care; 6 cases with unstable gait and self-care; 4 cases with slow gait and poor muscle strength. Among them, there were 5 cases of unilateral biceps tendon reflex hyperactivity, 7 cases of unilateral biceps tendon reflex weakness, 6 cases of triceps reflex weakness, 12 cases of unilateral Hoffmann’s sign ( + ), 2 cases of dynamic Hoffmann’s sign ( + ), 3 cases of Lhermitte’s sign ( + ), 12 cases of JOA score < 14. The JOA score was < 14 in 12 cases. 1.1.2 Imaging examinations: ①Cervical frontal, double oblique, extension and flexion dynamic lateral radiographs were routinely taken, except for cervical spine physiological curvature changes, degeneration and hyperplasia, spinal space narrowing or cervical instability, the lesioned segments were seen to have hyperplasia and space narrowing, including cervical 4,55 cases; cervical 5,5,64 cases; cervical 5,66 cases; cervical 5,6,6,72 cases. MRI examination: the main findings were segmental disc degeneration, protrusion with compression of the dura or/and spinal cord, and intramedullary high signal change in 8 cases. 1.1.3 Treatment All 17 cases underwent anterior intervertebral decompression with an anterolateral cervical transverse incision on one side or Cage fusion under cervical plexus anesthesia, among which 9 cases underwent unilateral single crooked vertebral joint resection and decompression, 1 case underwent unilateral upper and lower crooked vertebral joint resection, 4 cases underwent bilateral single crooked vertebral joint resection and decompression, and 3 cases underwent bilateral upper two segments and four crooked vertebral joints resection and decompression. According to the clinical symptoms, signs and imaging, one segment was decompressed in 9 cases, two segments were decompressed in 6 cases, and three segments were decompressed in 4 cases. The patients were placed on the floor from 1 d to 1 month after surgery, and they wore a neck brace for 2-3 months, and were followed up by outpatient radiographs at 3 months, 6 months, 1 year and 1.5 years after surgery. The average follow-up period was 12 months, from 6 to 20 months. According to the clinical performance and self-perception and neurological examination, the patients were classified as excellent: subjective symptoms disappeared, most of them disappeared or significantly reduced, limb function improved significantly, and urinary incontinence was restored in 9 cases; good: subjective symptoms partially disappeared and reduced, limb muscle strength increased, and bladder function improved in 8 cases; fair: same as before surgery, 0 cases; poor: condition worsened compared with before surgery, 0 cases; JOA < 14 JOA < 14 points in 6 cases. 3, Discussion 3.1.1 The hook joint is a synovial joint with rich distribution of myelinated and unmyelinated nerve fiber bundles in the capsule wall, i.e., the spinal retrolateral branch containing sympathetic nerve fibers, mainly innervating the posterior longitudinal ligament and the capsule wall of the hook joint. The formation of the bony flab can affect the diameter of the intervertebral foramen, the diameter of the cervical spinal canal and the diameter of the transverse foramen of the vertebral artery, resulting in various types of cervical spondylosis symptoms in clinical practice. In 12 cases, MR imaging of the vertebral artery confirmed that the vertebral artery was narrowed and displaced outward by the compression of the hypertrophic and hyperplastic leptomeningeal joint. In one typical patient, the patient felt that the affected limb was easy to think clearly, had a great increase in energy, and felt younger by more than ten years, and must take the initiative to shake hands with the doctor during the next day's examination to show that he had strength and muscle strength increased by more than grade I. Hoffmann’s sign was not induced. 3.1.2 Removal of the hooked vertebral joint was performed with self-processed long-tipped bone scissors, which were carefully bitten off and then ground with a high-speed electric drill, enabling safe and effective removal of the hooked vertebral joint with reliable decompression and better clinical treatment. For those who have bilateral limb symptoms and imaging shows bilateral hypertrophy of the hook vertebral joint leading to compression, a single transverse incision is used to complete bilateral hook vertebral joint resection and decompression. 3.1.3 MRI can show the whole picture of the lesion, and its vertebral artery visualization is non-invasive, without contrast, and can show the morphology, thickness, stroke, interruption or not of the vertebral artery and the site, segment, and degree of compression, etc., which can be combined with clinical symptoms and signs to determine the surgical site and the number of segments. 3.1.4 The cervical Cage is a titanium alloy threaded fusion device, which provides immediate stability after implantation, opens up the vertebral space, enlarges the intervertebral foramen area, has a high implant fusion rate and disappears the symptoms.