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The safety and efficacy of hybrid surgery for multilevel cervical degenerative disc disease versus anterior cervical discectomy and fusion or cervical disc arthroplasty: a systematic review and meta-analysis

  • Review Article - Spine degenerative
  • Published:
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Abstract

Background

Multilevel cervical degenerative disc disease (CDDD) can be treated surgically with anterior cervical discectomy and fusion (ACDF), cervical disc arthroplasty (CDA), or a hybrid surgery (HS) of the two in which both procedures are used at different vertebral levels. A systematic review and meta-analysis was performed to compare the clinical and radiographical outcomes of HS against ACDF or CDA alone.

Methods

Three electronic databases were searched for articles published before December 2018. The literature was searched and assessed by independent reviewers according to the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) statement.

Results

Eight papers were identified as eligible with a total of 424 patients. Post-operative C2–C7 range of motion (ROM) was significantly greater after HS than ACDF (p = 0.004; mean difference (MD) 6.14°). The ROM of the superior adjacent segment was significantly lower after HS than ACDF (p < 0.0001; MD − 2.87°) as was the ROM of the inferior adjacent segment (p = 0.0005; MD − 3.11°). HS patients’ return to work was shorter than those who underwent ACDF (p < 0.00001; MD − 32.01 days) and CDA (p < 0.00001; MD − 32.92 days). There were no statistically significant differences in functional outcomes following CDA compared with HS. There was no significant difference in operation time, intra-operative blood loss, or post-operative complications between any of the procedures.

Conclusion

The number of included studies was small, the heterogeneity between them was substantial, and the quality of evidence was very low. Large randomised controlled trials are required to provide strong evidence that would enable recommendation of one intervention over another.

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Acknowledgements

Mrs Sheila Fisken, Medical Librarian, University of Edinburgh for advice and assistance with an optimal search strategy.

Funding

This study did not receive funding to carry out this research. Dr Salma Ayis was funded by the National Institute for Health Research (NIHR) Biomedical Research Centre based at Guy’s and St Thomas’ NHS Foundation Trust and King’s College London.

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Marcus A. Hollyer.

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Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

Informed consent

Due to the nature of the study, informed consent from participants was not required.

Disclaimer

The views expressed are those of the author(s) and not necessarily those of the NHS, the NIHR, or the Department of Health.

Additional information

Comments

The group from Edinburgh performed a systematic literature review and meta-analysis with the aim to compare clinical and radiological outcomes after hybrid surgery for multilevel cervical degenerative disc disease. Those outcomes were compared against both anterior cervical fusion and motion preserving disc arthroplasty. With a poor quality of underlying included studies that predominantly report on Asian populations, also the results of this pooled analysis have to be interpreted with caution and are unlikely to provide us with clear guidance as to whether this option should be offered to our patients more often. The data, however, point towards at least noninferiority of hybrid surgery. Offering it to selected patients therefore appears reasonable and safe. With more experience gained over time—or should high-quality RCT data provide better evidence—the role of hybrid surgery will be better defined. The authors provide us with a good starting point from where this treatment option can progressively be explored.

Martin N. Stienen

Zurich (CH)/Stanford (USA)

Publisher’s note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

This article is part of the Topical Collection on Spine degenerative

This study was performed while the corresponding author was located at the University of Edinburgh.

Appendices

Appendix 1

((ACDF OR fusion OR discectomy) OR (disc replacement OR arthroplasty OR CDA OR ADR)) AND hybrid AND cervical

Appendix 2

Grade: HS vs ACDF

Question: HS compared with ACDF for cervical degenerative disc disease

Bibliography: Hybrid surgery versus ACDF or CDA for cervical degenerative disc disease. Cochrane Database of Systematic Reviews [Year], Issue [Issue].

figure c

CI: Confidence interval; MD: Mean difference; OR: Odds ratio

Explanation

a. Study Design: Only one of the studies that report this outcome is a RCT.

b. Bias downgraded 1 level: Inherent detection bias when measuring C2-C7 ROM as it is not possible to be blinded to patient's intervention as it is clear on the radiograph if they have a hybrid or ACDF.

c. Inconsistency downgraded 1 level: Statistical heterogeneity was high across all studies, but methodology similar using Cobb angles measured from lateral radiographs.

d. Imprecision downgraded 1 level: Number of participants is low.

e. Bias downgraded 1 level: Detection bias from self-reported outcomes via patient questionnaire, no mention of blinding of the staff assisting with clinical evaluation as to patients' treatment (with the exception of Kang et al).

f. Inconsistency downgraded 1 level: Statistical heterogeneity was high across all studies, but methodology in recording pain scores similar.

g. Inconsistency downgraded 2 levels: Statistical heterogeneity very high, and difference in type of prosthesis and 3-level/2-level surgery between studies may affect this outcome.

h. Moderate statistical heterogeneity

Grade: HS vs CDA

Question: HS compared with CDA for cervical degenerative disc disease

Bibliography: Hybrid surgery versus ACDF or CDA for cervical degenerative disc disease. Cochrane Database of Systematic Reviews [Year], Issue [Issue].

figure d

CI: Confidence interval; MD: Mean difference; OR: Odds ratio

Explanation

a. Bias downgraded 1 level: Inherent detection bias as it is not possible to be blinded to patient's intervention as it is clear on the radiograph if they have a disc replacement or a cage fusion.

b. Inconsistency downgraded 1 level: Statistical heterogeneity is high and data from Hey et al are median not mean values.

c. Imprecision downgraded 1 level. Number of patients analysed is very low, 95% CI of average effect size is very wide.

d. Bias downgraded 1 level: Detection bias from self-reported outcomes via patient questionnaire, no mention of blinding of the staff assisting with clinical evaluation as to patients' treatment.

e. Inconsistency downgraded 2 levels: Statistical heterogeneity is high and clinical heterogeneity that could effect this outcome relating to time in collar post op.

f. Imprecision downgraded 1 level: Number of patients analysed is very low.

g. Performance bias and detection bias inherent in surgical procedure and risk of bias from study design, however these are unlikely to affect this outcome.

h. Imprecision downgraded 1 level. Number of patients analysed is very low, but pooled effect estimate does not cross the line of null effect.

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Hollyer, M.A., Gill, E.C., Ayis, S. et al. The safety and efficacy of hybrid surgery for multilevel cervical degenerative disc disease versus anterior cervical discectomy and fusion or cervical disc arthroplasty: a systematic review and meta-analysis. Acta Neurochir 162, 289–303 (2020). https://doi.org/10.1007/s00701-019-04129-3

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