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Clinical outcomes of locking stand-alone cage versus anterior plate construct in two-level anterior cervical discectomy and fusion: a systematic review and meta-analysis

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Abstract

Background

Two-level cervical degenerative disc disease (cDDD) can be effectively treated by anterior cervical discectomy and fusion (ACDF) similarly to single-level cDDD. Traditionally an anterior plate construct (APC) approach has been utilized, but ACDF without plate with a locking stand-alone cage (LSC) approach has emerged as an alternative option. The aim of this study was to compare the clinical outcome of LSC and APC in contiguous two-level ACDF used to treat cDDD the current literature.

Methods

Searches of seven electronic databases from inception to March 2018 were conducted following preferred reporting items for systematic reviews and meta-analyses (PRISMA) guidelines. Extracted data were analysed using meta-analysis of proportions.

Results

The nine observational studies that satisfied all criteria described a pooled cohort of 687 contiguous two-level cDDD cases managed by ACDF, with 302 (44%) and 385 (56%) managed by LSC and APC approaches, respectively. When compared with APC, LSC was associated with significantly increased subsidence likelihood (OR 2.75; p < 0.001), greater disc height (MD 0.60 mm; p = 0.04) and reduced cervical lordosis (MD − 2.52°; p = 0.04) at last follow-up. Operative outcomes, fusion rates, functional scores and postoperative dysphagia rates were comparable.

Conclusion

Although significant radiological differences were most evident, the comparability between LSC and APC in contiguous two-level ACDF with respect to all other clinical outcomes does not implicate one approach as clearly superior to the other in two-level ACDF. Larger, randomized studies with longer follow-up are required to delineate outcomes further to validate the findings of this study.

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Authors and Affiliations

  1. Prince of Wales Clinical School, University of New South Wales, Sydney, Australia

    Victor M. Lu, Ralph J. Mobbs & Kevin Phan

  2. NeuroSpine Surgery Research Group (NSURG), Prince of Wales Private Hospital, Sydney, Australia

    Ralph J. Mobbs & Kevin Phan

  3. Faculty of Medicine, Sydney Medical School, University of Sydney, Sydney, Australia

    Bernard Fang

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  1. Victor M. Lu
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Lu, V.M., Mobbs, R.J., Fang, B. et al. Clinical outcomes of locking stand-alone cage versus anterior plate construct in two-level anterior cervical discectomy and fusion: a systematic review and meta-analysis. Eur Spine J 28, 199–208 (2019). https://doi.org/10.1007/s00586-018-5811-x

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