Short-Term Clinical Evaluation Of Zero-P Intervertebral Fusion System For Anterior Monosegmental Cervical Fusion

Objective: To evaluate clinical efficacy of Zero-P intervertebral fusion system for anteriormonosegmental cervical fusion.Methods:Forty one patients with cervical spondylosis who received anterior cervicaldecompression between August2011and August2012enrolled in this study. We dividedclinical material into two groups: of study group（Group of Zero-P）of18cases and controlgroup （Group of ACDF） of23cases. Pre and postoperative, and last follow-up visualanalog scale (VAS) score on neck and upper extremity, and JOA (Japanese OrthopaedicAssociation) score, Odom function score at last follow-up and severity of dysphasia wererecorded. Cobb’s angle of functional segment and cervical alignment also observed. Atseventh days, third month, sixth month, twelfth month after surgery, anterior-posteriorcervical fluoroscopy was done for evaluation of fixation.Results:The preoperative situations including age, sex and operation segments of twogroups had no statistical differences. The mean follow up time was8.6months, there wasno significant difference between two groups. The operative time was62.2min andintraoperative blood loss was120.6ml in study group. In control group the operative timewas83.0min and intraoperative blood loss was131.3ml, there were statistical differences inoperation time and blood loss (p<0.05). At the last follow up, VAS score of study group (cervical VAS：0.56，VAS of upper extremity：0.61) had no significant difference withcontrol group (cervical VAS：0.61，VAS of upper extremity：0.65). Odom functionalscores of two groups was100%respectively at the last follow up. There was no statisticaldifferent between study group (94%) and control group (91%) in JOA recovery rate. Thegeneral cervical alignment had no difference. In study group there were3cases withdysphagia and control group had10cases.Conclusion: Recovery rates of two groups are similar. And comparing with traditionalACDF, cervical fusion with Zero-P had shorter operation time, less blood loss and lowerincidence of dysphagia. Cervical fusion with Zero-p also can improve the segmentalcervical alignment.