• Zuowei Wang, Xingwen Wang, Fengzeng Jian, Can Zhang, Hao Wu, and Zan Chen.
• Department of Neurosurgery, Division of Spine, China International Neurological Institute, Xuanwu Hospital, Capital Medical University, Beijing, People's Republic of China.
• Eur Spine J. 2017 Apr 1; 26 (4): 1019-1027.

PurposeThe purpose of this study focuses on the changes of the syrinx volume after posterior reduction and fixation of the basilar invagination (BI) and atlantoaxial dislocation (AAD) with syringomyelia.MethodsWe retrospectively analyzed the clinical outcome and syrinx volume changes in 71 patients with BI, AAD and syringomyelia treated with the posterior reduction and fixation technique.ResultsClinical improvement was observed in 64 (90.1 %) patients postoperatively; 5 (7.0 %) were stable and 2 (2.8 %) were clinically aggravated. The postoperative Atlantodental interval became normal in 61 patients (86.0 %); showed reduction that was greater than 50 % but not complete in 5 patients (7.0 %); and reduction which was less than 50 % in 5 patients (7.0 %). The size of the syrinx was reduced postoperatively in 66 patients (93.0 %) while no change in the remaining 5 patients (7.0 %).ConclusionsPosterior reduction and fixation of the AAD and BI can effectively enlarge the foramen magnum, improve the cerebrospinal fluid circulation and consequently reduce the volume of the syrinx.

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