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Subaxial subluxation after atlantoaxial transarticular screw fixation in rheumatoid patients

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Abstract

The most common cervical abnormality associated with rheumatoid arthritis (RA) is atlantoaxial subluxation, and atlantoaxial transarticular screw fixation has proved to be one of the most reliable, stable fixation techniques for treating atlantoaxial subluxation. Following C1–C2 fixation, however, subaxial subluxation reportedly can bring about neurological deterioration and require secondary operative interventions. Rheumatoid patients appear to have a higher risk, but there has been no systematic comparison between rheumatoid and non-rheumatoid patients. Contributing radiological factors to the subluxation have also not been evaluated. The objective of this study was to evaluate subaxial subluxation after atlantoaxial transarticular screw fixation in patients with and without RA and to find contributing factors. Forty-three patients who submitted to atlantoaxial transarticular screw fixation without any concomitant operation were followed up for more than 1 year. Subaxial subluxation and related radiological factors were evaluated by functional X-ray measurements. Statistical analyses showed that aggravations of subluxation of 2.5 mm or greater were more likely to occur in RA patients than in non-RA patients over an average of 4.2 years of follow-up, and postoperative subluxation occurred in the anterior direction in the upper cervical spine. X-ray evaluations revealed that such patients had a significantly smaller postoperative C2–C7 angle, and that the postoperative AA angle correlated negatively with this. Furthermore, anterior subluxation aggravation was significantly correlated with the perioperative atlantoaxial and C2–C7 angle changes, and these two changes were strongly correlated to each other. In conclusion, after atlantoaxial transarticular screw fixation, rheumatoid patients have a greater risk of developing subaxial subluxations. The increase of the atlantoaxial angel at the operation can lead to a decrease in the C2–C7 angle, followed by anterior subluxation of the upper cervical spine and possibly neurological deterioration.

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Acknowledgments

No funds were received in support of this work. No benefits in any form have been or will be received from a commercial company related directly or indirectly to the subject of this manuscript.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, Kyoto University Graduate School of Medicine, 54 Kawahara-cho, Shogoin, Sakyo, Kyoto, 606-8507, Japan

    Hiromu Ito, Masashi Neo, Takeshi Sakamoto, Shunsuke Fujibayashi, Hiroyuki Yoshitomi & Takashi Nakamura

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  1. Hiromu Ito
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  2. Masashi Neo
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  3. Takeshi Sakamoto
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  4. Shunsuke Fujibayashi
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  5. Hiroyuki Yoshitomi
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  6. Takashi Nakamura
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Correspondence to Hiromu Ito.

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Ito, H., Neo, M., Sakamoto, T. et al. Subaxial subluxation after atlantoaxial transarticular screw fixation in rheumatoid patients. Eur Spine J 18, 869–876 (2009). https://doi.org/10.1007/s00586-009-0945-5

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  • DOI: https://doi.org/10.1007/s00586-009-0945-5

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