Clinical results of the Ito method “single-opening” cervical spinal canal expansion laminoplasty. Methods: In 123 patients with developmental cervical spinal stenosis, continuous ossification of the posterior longitudinal ligament (OPLL) and multisegmental spondylolisthesis, the Ito method “single-opening” cervical spinal canal expansion laminoplasty was performed, and the bone graft was fixed between the lifted lamina and the small joint by wire or nylon thread on the opening side. ～The mean follow-up period was 5.3 years, from 2 to 14 years. Results: The average preoperative JOA score was 9.1, and the average JOA score at follow-up was 14.4. The average improvement rate was 67.0%, of which 44 cases were excellent (50.6%), 26 cases were good (29.9%), 11 cases were acceptable (12.6%), and 6 cases were poor (6.9%). Postoperative lateral radiographs showed that the diameter of the spinal canal was enlarged from 1.5 to 7.0 mm, with an average of 4.1 mm, and the enlargement rate of the spinal canal was 15% to 100%, with an average of 40%. Postoperative CT showed that the bone graft healed well without reclosure, and MRI showed that the spinal cord was released from compression. Complications included axial symptoms (57 cases of neck pain or stiffness), nerve root palsy (4 cases), and limitation of neck movement (115 cases of rotation, hyperextension, flexion, or lateral flexion). Conclusion: The Ito method “single-opening” cervical spinal canal enlargement laminoplasty is a safe and effective surgical method for the treatment of developmental cervical spinal stenosis, continuous cervical ossification of the posterior longitudinal ligament (OPLL), and multisegmental spinal cord disease, and the canal enlargement is stable and durable, but its complications need to be further resolved.