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Comparison of the clinical and radiologic outcomes obtained with single- versus two-level anterior cervical decompression and fusion using stand-alone PEEK cages filled with allograft

  • Clinical Article - Spine
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Abstract

Background

Although anterior cervical decompression and fusion with a stand-alone cage (ACDF-SAC) is accepted as a suitable procedure, the outcomes of the multi-level procedure remain controversial. The aim of this study is to compare the clinical and radiologic outcomes achieved with single versus two-level ACDF-SAC along with identification of the factors that contribute to loss in mean disc height (MDH) and change in cervical lordotic angle (CLA).

Methods

A total of 109 consecutive patients who underwent ACDF-SAC for degenerative spondylosis were reviewed. Patients were divided into two groups according to surgical level (group A, single; group B, two) and were followed for at least 1 year. Clinical outcomes were evaluated using the visual analog scale (VAS) and Robinson’s criteria. The fusion and subsidence rates, MDH, CLA, anterior, and posterior vertebral body height of the fused segments (AVBH, PVBH) were measured retrospectively from plain radiographs.

Results

Clinical outcomes were similar in both groups, in terms of decreasing VAS score and a grade higher than “good” by Robinson’s criteria. The fusion and subsidence rates for each group were found to be 92.2, 91.1, 14.1, and 20.0 %, respectively. The MDH (mm) increased by 1.44 ± 0.96 in group A, 1.57 ± 0.79 and 1.66 ± 0.69 for each surgical level in group B over the 12 postoperative months. The CLA (°) decreased by 1.70 ± 4.04 and 0.75 ± 6.12 over the 12 postoperative months from its presurgery value, the rate of kyphosis >5° was 26.6 and 22.2 % for each group. All compared values were not significantly different between the two groups. Correlation analysis revealed that the AVBH/PVBH ratio exhibited a positive correlation with CLA change in both groups (r = 0.368, 0.397; p = 0.018, 0.040).

Conclusions

The overall outcomes achieved with two-level ACDF-SAC were similar to those achieved with single-level ones. In addition, the AVBH/PVBH ratio might be a predictable marker for a postoperative kyphosis.

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Authors and Affiliations

  1. Department of Neurosurgery, Kyung Hee University Hospital, Kyung Hee University School of Medicine, 23 Kyungheedae-ro, Dongdaemun-gu, Seoul, South Korea, 130-872

    Man Kyu Choi, Sung Bum Kim & Chang Kyu Park

  2. Department of Neurosurgery, Kyung Hee University Hospital, Gangdong, Seoul, South Korea

    Sung Min Kim

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  1. Man Kyu Choi
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  2. Sung Bum Kim
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Correspondence to Sung Bum Kim.

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Conflict of interest

The authors have no personal financial or institutional interest in any of the drugs, materials, or devices described in this article.

Funding

No funding was received for this research.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. For this type of study formal consent is not required.

Informed consent

This retrospective manner was approved by permission of our institutional review board (IRB) and the board permitted waiver of informed consent.

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KMC IRB 1520-11

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Choi, M.K., Kim, S.B., Park, C.K. et al. Comparison of the clinical and radiologic outcomes obtained with single- versus two-level anterior cervical decompression and fusion using stand-alone PEEK cages filled with allograft. Acta Neurochir 158, 481–487 (2016). https://doi.org/10.1007/s00701-015-2692-1

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  • DOI: https://doi.org/10.1007/s00701-015-2692-1

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