• World Neurosurg · Feb 2019

    Meta Analysis

    Incidence of C5 Palsy: Meta-Analysis and Potential Etiology.

    • Hiroyuki Yoshihara, Adam Margalit, and Daisuke Yoneoka.
    • Department of Orthopaedic Surgery and Rehabilitation Medicine, SUNY Downstate Medical Center, Brooklyn, New York, USA; Department of Orthopaedic Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan. Electronic address: hiroyoshihara55@yahoo.co.jp.
    • World Neurosurg. 2019 Feb 1; 122: e828-e837.

    BackgroundAmong the proposed hypotheses for C5 palsy, the most acceptable etiologies have been the tethering effect of the spinal nerve or reperfusion injury of the spinal cord. We performed a meta-analysis to determine a potential etiology of C5 palsy.MethodsThe PubMed, Embase, Web of Science, and Cochrane Library databases were searched up to 2017 for relevant studies of the incidence of C5 palsy after cervical decompression surgery. Relevant incident estimates of C5 palsy stratified by the surgical approach and underlying diagnosis were calculated using an appropriate meta-analysis.ResultsA total of 107 studies were included for our meta-analysis. The pooled incidence of C5 palsy was 0.00 (95% confidence interval [CI], 0.00-0.01) for anterior decompression in patients with radiculopathy, 0.04 (95% CI, 0.03-0.05) for anterior decompression and 0.07 (95% CI, 0.06-0.08) for posterior decompression in patients with myelopathy. A two-tailed t test with unequal variance accepted the null hypothesis of no differences in the incidence between anterior and posterior decompression in patients with myelopathy (P = 0.999) and rejected the hypothesis of no differences in the incidence between the patients with radiculopathy and myelopathy in anterior decompression (P < 0.001).ConclusionsWith no significant difference found in the incidence of C5 palsy between anterior and posterior cervical decompression in patients with myelopathy, the tethering effect of the spinal nerve might not be a plausible etiology for C5 palsy. In contrast, we found a significantly greater incidence of C5 palsy in patients with myelopathy compared with those with radiculopathy undergoing anterior decompression, which might support the reperfusion injury of the spinal cord as the etiology of C5 palsy.Copyright © 2018 Elsevier Inc. All rights reserved.

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