Treatment of Multi - segmental Cervical Spondylotic Myelopathy Treated Posterior Unilateral Open-door Laminoplasty Combined with Centerpiece Ttitanium Plate Internal Fixation

Abstract：Objective To explore the clinical effect and safty of posterior unilateral open-door laminoplasty combined with Centerpiece titanium plate internal fixation for multi-segmental cervical spondylotic myelopathy. Methods From May 2010 to May 2012,32 patients with multi-segmental cervical spondylotic myelopathy were treated by posterior unilateral open door laminoplasty combined with Centerpiece titanium plate internal fixation. There were 20 males and 12 females,with a mean age of(60. 4 ± 7. 6)years(ranged 49 to 77 years). The neurofunction was evaluated by Japan Orthopaedic Association(JOA) score. The cervical curvature angle(α)was demonstrated by the cross angle between posterior vertebral body margins of C2 and C7 on cervical radiographs. Calculated cervical range of motion according to the difference of the angle of α between hyperex-tension and hyperflexion cervical radiographs. Calculated shoulder and pain VAS scores assess the range of axial symptoms. Re-sults The operative time and intraoperative blood loss were respectively 140 min(100 ~ 160 min)and 460 mL(250 ~ 800) mL. All patients were followed up from 12 to 38 months with an median of 22 months. The JOA scores was(9. 26 ± 3. 16)be-fore surgery and(12. 95 ± 2. 35)at 1 week after surgery,which showed significant differences(P ﹤ 0. 05). The improve rate of Japanese Orthopaedic Association(JOA)scores was(56. 4 ± 9. 3)% . The JOA scores was(13. 30 ± 2. 46)3 months after surgery and(13. 16 ± 1. 39)1 year after surgery,there were no significant differences when compared with the JOA scores at 1 week after surgery(P ﹥ 0. 05). The cervical curvature angle were(18. 1 ± 3. 8)° before surgery an(16. 7 ± 5. 4)° 3 months after surgery. There were no significient differences(P ﹥ 0. 05). The cervical range of motion was(35. 46 ± 11. 54)° before surgery and(30. 65 ± 8. 95)° 3 months after surgery. There were no significient differences(P ﹥ 0. 05). The VAS scores were ((3. 8 ± 1. 8)before surgery and(1. 6 ± 1. 5)3 months after surgery,which had significient differences(P ﹥ 0. 05). Conclu-sion Posterior unilateral open-door laminoplasty combined with Centerpiece titanium plate internal fixation can effectively im-prove neurofunction of patients with multi-segmental cervical spondylotic myelopathy and conserve cervical curvature and activ-ity. It is an effective and safe method for multi-segmental cervical spondylotic myelopathy.