The Efficacy Of Zero-P Implant In Single Segment ACDF:a Prospective Study

ObjectiveThe aim of this study was to analyze the primary efficacy and safety of Zero-P implant in anterior cervical discectomy and fusion (ACDF) in patients who were diagnosed with single segment cervical disc herniation.Material and Methods45patients (27male and18female) were selected to undergo single segment ACDF with Zero-P implant. These patients were followed up for18to30months (mean21.9months). Japanese Orthopaedic Association (JOA) score, Odom criteria and Bazaz-Yoo dysphagia index for postoperative dysphagia were performed for clinical evaluation with patients pre-and post-operative. The pre-and post-operative x-ray imaging, CT scan, and MRI were done to evaluate the cervical vertebra.ResultsThe JOA scores and recovery rate significantly increased at3-,12-month follow- up. The curative effect of surgery obviously changed within1year, and didn’t change significantly after1year. At7-day follow-up, the incidence of dysphagia-related symptoms were found in15patients (33%) with mild dysphagia,1patient (2.2%) with moderate dysphagia, and disappeared within3months.Conclusions:The primary clinical and radiographic efficacy of Zero-P used in ACDF was satisfactory, with adequate decompression, reliable stabilization and lower rates of dysphagia of anterior cervical compared with cage with anterior plate. Neither adjacent segment degeneration nor implant-related complications were observed. Randomized controlled trials would be required for future study.