[The clinical efficacy of posterior cervical open-door expansive laminoplasty combined with Key-hole technique for the treatment of mixed cervical spondylosis].

Objective: To investigate the clinical efficacy of posterior cervical open-door expansive laminoplasty combined with Key-hole technique in treating mixed cervical spondylosis. Methods: A retrospective cohort study. A retrospective analysis was made of 128 cases of mixed cervical spondylosis with symptoms of spinal cord and nerve root compression and complete follow-up data admitted to the Department of Spinal Surgery, Affiliated Hospital of Jining Medical University from January 2016 to June 2022. Of the patients, there were 90 males and 38 females with a mean age of (58.5±9.8) years. Before February 2018, 72 cases were treated with posterior cervical open-door expansive laminoplasty (single-door group), and after February 2018, 56 cases were treated with posterior cervical open-door expansive laminoplasty combined with Key-hole technique (combined group). There was no significant difference between the two groups in age, Japanese Orthopaedic Association (JOA) score, visual analogue scale (VAS) score of pain and Cobb angle of imaging before operation. The operation time, intraoperative blood loss, postoperative JOA score, VAS score and Cobb angle of imaging were compared between the two groups. Results: Both groups of patients successfully completed the operation. Operation time [M(Q1, Q3)]: 89.0 (68.5, 104.5) min in the single-door group and 90.0 (72.8, 108.8) min in the combined group, there was no statistical difference between the two groups (P=0.640). The intraoperative blood loss in the single-door group was 100 (100, 200) ml, and it was 100(100, 200) ml in the combined group, there was no significant difference between the two groups (P=0.680). Postoperative JOA scores increased significantly, while VAS scores decreased significantly in both groups. At the last follow-up, the JOA and VAS scores of the combined group were better than those of the single-door group (both P<0.05). Conclusion: The posterior cervical open-door expansive laminoplasty combined with Key-hole technique for the treatment of mixed cervical spondylosis can effectively remove the compression on the cervical spine without causing cervical instability.