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This forest plot shows pooling of risk ratios for reoperations at midterm followup. The reoperation rates related to index surgery were lower for patients treated with cervical disc arthroplasty, however, there was no difference for reoperation rates at adjacent levels between the cervical disc arthroplasty group and the fusion group. M-H = Mantel-Haenszel method; ACDF = cervical decompression and fusion; CDA = cervical disc arthroplasty.
