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J Spinal Disord Tech. 2013 Jan 5. [Epub ahead of print]

Single Stage Anterior Release and Sequential Posterior Fusion for Irreducible Atlantoaxial Dislocation.

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  • 1Department of Spinal Surgery, Xi'an Red Cross Hospital, Xi'an, China.


STUDY DESIGN:: A retrospective study. OBJECTIVE:: To introduce the method of single stage anterior release and reduction with posterior fusion in irreducible atlantoaxial dislocation (IAAD) and to evaluate the clinical effects of this surgery. SUMMARY OF BACKGROUND DATA:: In previous clinical studies, several techniques have been introduced to manage IAAD. But all these treatments have intrinsic disadvantages. A single stage anterior release and reduction with posterior fusion can offer a new alternative which can avoid these disadvantages. METHODS:: From January 2003 to January 2009, 22 cases of IAAD were diagnosed consecutively. Anterior atlantoaxial release was performed through anterior retropharyngeal approach, following traction reduction conducted on the monitoring of C-arm fluoroscopy. C1-C2 were then fixed posteriorly and fused by single stage. Neurologic status was evaluated using the JOA scoring system. RESULTS:: All patients were observed for an average of 32 months, ranging from 15 to 40 months. They were reduced to anatomy position and got bone fusion. JOA score of 12 patients with myelopathy improved from 8.3 to 13.9, 6 months postoperatively, and the mean improving rate was 87.5%. No graft or implant-related complications were observed in any patients during the entire follow-up period. CONCLUSION:: The method of single stage anterior release and reduction with posterior fusion is an effective method for management of irreducible atlantoaxial dislocation, proving its value as a technique for achieving complete reduction with solid bony fusion.

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