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Strategies to avoid internal carotid artery injury in “sandwich” atlantoaxial dislocation patients during surgery

  • Original Article - Spine - Other
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Abstract

Purpose

To elucidate the anatomic relationship between the internal carotid artery (ICA) and the bony structures of the craniovertebral junction among “sandwich” atlantoaxial dislocation (AAD) patients, and to analyze the risks of injury during surgical procedures.

Methods

The distance from the medial wall of ICA to the midsagittal plane (D1), the shortest distance between the ICA wall and the anterior cortex of the lateral mass of atlas (LMA) (D2) on the most caudal and cranial levels of LMA and the angle (A) between the sagittal plane passing through the screw entry point of C1 lateral mass(C1LM) screw and the medial tangent line of the vessel passing through the entry point were measured. Besides, the location of ICA in front of the atlantoaxial vertebra was divided into 4 categories (Z1–Z4).

Results

There was a statistically difference between the male and female patients regarding D1, and the difference between D2 at level a and level b as well as angle A between the left and right sides were statistically different (p < 0.05). Ninety-two ICAs (57.5%) were anteriorly located in Z3, 50 (31.3%) were located in Z4, 17 were located in Z2, and only one ICA was located in Z1 in all 80 patients.

Conclusions

In “sandwich” AAD patients, particular attention should be paid to excessively medialized ICA to avoid ICA injury during trans-oral procedures, and the risk of injuring the ICA with more cranially and medially angulated C1LM screw placement was relatively less during posterior fixation procedures. A novel classification of ICA location was used to describe the relationship between ICA and LMA.

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Data availability

This study is based on confidential patient data which are available upon request from the author SLW.

Code availability

Not applicable.

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Author notes

  1. Yinglun Tian and Nanfang Xu contributed equally to this work.

Authors and Affiliations

  1. Department of Orthopaedics, Peking University Third Hospital, Haidian District, No. 49 North Garden Road, Beijing, 100191, China

    Yinglun Tian, Nanfang Xu, Ming Yan, Jinguo Chen, Kan-Lin Hung, Xiangyu Hou, Shenglin Wang & Weishi Li

  2. Beijing Key Laboratory of Spinal Disease Research, Haidian, Beijing, 100191, China

    Yinglun Tian, Nanfang Xu, Ming Yan, Jinguo Chen, Kan-Lin Hung, Xiangyu Hou, Shenglin Wang & Weishi Li

  3. Engineering Research Center of Bone and Joint Precision Medicine, Ministry of Education, Beijing, China

    Shenglin Wang & Weishi Li

Authors
  1. Yinglun Tian
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  2. Nanfang Xu
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  3. Ming Yan
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  4. Jinguo Chen
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  5. Kan-Lin Hung
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Corresponding authors

Correspondence to Shenglin Wang or Weishi Li.

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This was a retrospective study and the formal ethics approval has been required as ruled by the ethics committee of Peking University Third Hospital.

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The authors declare no competing interests.

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Tian, Y., Xu, N., Yan, M. et al. Strategies to avoid internal carotid artery injury in “sandwich” atlantoaxial dislocation patients during surgery. Acta Neurochir 165, 1155–1160 (2023). https://doi.org/10.1007/s00701-022-05449-7

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  • DOI: https://doi.org/10.1007/s00701-022-05449-7

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