[Clinical application of titanium miniplate in cervical expansive open-door laminoplasty].

Objective:To evaluate the clinical effects of titanium miniplate in cervical expansive open-door laminoplasty in treating cervical spondylosis. Methods:From February 2009 to April 2011,16 patients underwent expansive open-door laminoplasty by titanium miniplate fixation were classified as group A;18 patients with conventional unilaterally open-door laminoplasty from March 2007 to January 2009 were served as control(group B). The operative time,blood loss during the operations,JOA score of the 6 months after operation,the incidence of axial symptom,curvature of cervical vertebrae were compared respectively between the two groups. Results:Operative time,blood loss,improvement rate of JOA in group A were respectively(122.0±26.8) min,(153.0±46.7) ml,(59.4±11.6)%; and in group B were(119.0±28.6) min,(151.0±50.4) ml,(58.7±12.7)%. Those showed no significant difference between two groups(P0.05). Three cases(18.75%)occurred obviously axial symptom in group A and six cases(33.33%) occurred in group B,there was significant difference in the incidence of axial symptom between two groups(P0.01). Preoperative and postoperative curvature of cervical vertebrae in group A was (17.9±5.2)° and(18.2±4.8)°,without significant difference;in group B,postoperative curvature of cervical vertebrae decreased obviously than the preoperative[(16.3±5.9)° vs(18.1±6.3)°](P0.05). Conclusion:Both surgical protocols are effective on preventing reclose of opened laminae,moreover the modified laminoplasty is advanced on reducing the occurrence of axial symptoms and loss of cervical curvature.