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The forest plot shows the frequency of reoperation at adjacent levels after cervical disc arthroplasty versus anterior cervical discectomy and fusion. The size of the squares reflects the weight of the trial in pooled analysis. The horizontal bars represent the 95% CI. MH = Mantel-Haenszel; df = degrees of freedom; CDA = cervical disc arthroplasty; ACDF = anterior cervical discectomy and fusion.
