Abstract
Background
For patients with single-level cervical radiculopathy, various types of motion preservation surgeries, such as total disc replacement (TDR), posterior cervical foraminotomy (PCF) and posterior percutaneous endoscopic foraminotomy and discectomy (PECF), are available. In addition to motion preservation, the quality of motion is an important issue. The aim of the present study was to evaluate the influence of these surgeries on cervical motion by comparing the instantaneous axis of rotation (IAR) among PECF, TDR and PCF at the index and superior/inferior adjacent segments.
Methods
A retrospective review was performed of patients who underwent index surgery at C5–6 for cervical single-level foraminal disc herniation or foraminal stenosis. Patients with minimal degeneration at the index and other cervical spinal levels and flexion/extension cervical lateral radiographs both preoperatively and 6 months postoperatively were included (PECF, 11 patients; TDR, 11 patients; PCF, 12 patients). The IARs were calculated at the index segment and segments above and below the index segment from the flexion and extension cervical lateral radiographs, which were obtained preoperatively and 6 months postoperatively. A standardized cervical normogram was referenced to qualify shifts in the IAR.
Results
Postoperatively, neck pain was significantly decreased, with no difference among the surgical methods. The IARs were not significantly changed after the PECF. Although significant inferior shift occurred at C6–7 after TDR (p = 0.02), the shift occurred within the normal range in the cervical normogram. However, significant inferior shifts in the IARs occurred after PCF at C5–6 (p = 0.02) and C6–7 (p = 0.02), and the IARs moved out of the normal range.
Conclusions
The IARs were significantly changed after PCF at either the index segment or the adjacent segment below. The shifts in IAR at the index and adjacent segments were not significant after PECF and TDR. The sample size was too small to allow definitive conclusions, but the present study showed that PECF may be another alternative to motion preservation surgeries.
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Funding
Seoul National University Hospital provided financial support in the form of a research grant (Grant No. 0320160210; 2016–1062). The sponsor had no role in the design or conduct of this research.
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Drs. C.H. Kim, K.T. Kim, C.K. Chung, Y. Choi, and T.H. Park had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Drs. C.H. Kim, K.T. Kim, T.H. Park and C.K. Chung designed the study protocol. Drs. C.H. Kim, and T.H. Park managed the literature searches and summaries of the previous related works and wrote the first draft of the manuscript. Drs. C.K. Chung, K.T. Kim and Y. Choi provided revisions for intellectual content and the final approval of the manuscript.
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C.H. Kim is a consultant at Richard Wolf GmbH. All the other authors certify that they have no affiliations with or involvement in any organization or entity with any financial interest (such as honoraria; educational grants; participation in speakers’ bureaus; membership, employment, consultancies, stock ownership, or other equity interest; and expert testimony or patent-licensing arrangements), or non-financial interest (such as personal or professional relationships, affiliations, knowledge or beliefs) in the subject matter or materials discussed in this manuscript.
Ethical approval
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. This study was approved by the institutional review board of Seoul National University Hospital (H-1702-015-829).
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Informed consent was obtained from all individual participants included in the study.
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Kim, C.H., Park, T.H., Chung, C.K. et al. Changes in cervical motion after cervical spinal motion preservation surgery. Acta Neurochir 160, 397–404 (2018). https://doi.org/10.1007/s00701-017-3375-x
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DOI: https://doi.org/10.1007/s00701-017-3375-x