• Chin-Chu Ko, Bo-Kai Feng, Yi-Hsuan Kuo, Chao-Hung Kuo, Tsung-Hsi Tu, Chih-Chang Chang, Henrich Cheng, Wen-Cheng Huang, and Jau-Ching Wu.
• Department of Neurosurgery, Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan.
• Neurosurgery. 2023 Aug 1; 93 (2): 330338330-338.

BackgroundImplant dislocation after cervical disk arthroplasty (CDA) is obviously a critical complication, but no information about the incidence and associated risk factor has been reported.ObjectiveTo investigate the incidence and risk factor of implant dislocation after CDA by a retrospective cohort analysis.MethodsA retrospective review of a consecutive series of CDA performed between January 2009 and March 2021 at a single institution was conducted. Analyses of chart records and radiological data established the incidence and associated risk factor of implant dislocation after CDA. A Kaplan-Meier survival estimation of implant survival was performed.ResultsA total of 756 consecutive patients were included in this analysis. Five patients (0.7%) had a migration and even dropout of the artificial disk. The overall cumulative survival rate of the implant reached approximately 99.3% of the 756 patients. Preoperative kyphosis was significantly related to implant dislocation ( P = .016), with an odds ratio of 15.013.ConclusionThe incidence of implant dislocation after CDA is as low as 0.7% or 5/756 patients. Preoperative kyphosis significantly increases the risk of postoperative implant dislocation by a factor of 15. The migrating implants could be revealed on radiographs as early as 0.9 to 1.4 months postoperatively and were revised to anterior cervical diskectomy and fusion within half a year. No new event of implant dislocation occurred half a year postoperatively. The overall cumulative survival rate of the implant reached 99.3% of the 756 patients. In conclusion, CDA remains a safe and reliable procedure.Copyright © Congress of Neurological Surgeons 2023. All rights reserved.

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