C1 Lateral Mass Screw Placement in Occipitalization With Atlantoaxial Dislocation and Basilar Invagination

基底内陷 医学 寰枢关节 外科 枕骨 还原(数学) 颈椎 减压 齿状突 地图集(解剖学) 侧块 解剖 固定(群体遗传学) 关节脱位 内陷 颈椎 颅骨 人口 环境卫生 数学 几何学
作者
Yong Yin,Xinguang Yu,Guangyu Qiao,Shubin Guo,Jianning Zhang
出处
期刊:Spine [Ovid Technologies (Wolters Kluwer)]
卷期号:39 (24): 2013-2018 被引量:27
标识
DOI:10.1097/brs.0000000000000611
摘要

In Brief Study Design. Retrospective study of 146 patients with the diagnosis of occipitalization, atlantoaxial dislocation (AAD) and basilar invagination, using a novel surgical treatment strategy. Objective. To introduce a novel fixation and reduction technique. Summary of Background Data. Atlas occipitalization associated with basilar invagination often result in fixed AAD that need reduction and occipitocervical fixation. The widely used occipitocervical fixation with suboccipital screws has several limitations such as the poor screw purchase in maldevelopment of the occipital bone, limited area available for implants in previous suboccipital craniectomy. The placement of occipitalized C1 lateral mass screw is an alternative option. Methods. From June 2007 to June 2013, 146 patients of occipitalized atlas with fixed AAD and basilar invagination, underwent fixation and reduction via C1 lateral mass and C2 pars/pedicle screw. Results. A total of 143 patients achieved the follow-up in the range from 6 months to 4 years (average, 30 mo). Neurological improvement was seen in all the 143 patients, with the averaged Japanese Orthopedic Association scores increasing from 11.6 to 15.5. Radiographical evaluation showed that solid bony fusion was achieved in all patients, and complete reduction was attained in 95 patients, and partial reduction (>60%) in 40 patients, and no effective reduction in 8 patients who had additional transoral decompression. Magnetic resonance imaging demonstrated that the ventral cervicomedullary compression was relieved in all patients. Conclusion. Although technically demanding, the C1 lateral mass placement in occipitalization is very useful in the rescue situation where more conventional stabilization alternatives are not technically possible, or as routine occipitocervical stabilization. It provides firm stabilization offering an optimum situation for bony fusion, and meanwhile the effective reduction of fixed AAD and basilar invagination. An extremely high fusion rate can be expected with minimal complications and minimal postoperative immobilization with this technique. Level of Evidence: 4 The widely used occipitocervical fixation with suboccipital screws has several limitations. A total of 146 patients of occipitalized atlas with fixed atlantoaxial dislocation and basilar invagination underwent fixation and reduction via C1 lateral mass screw placement. The result that all the patients achieved good outcomes at follow-up indicates that this is a promising technique.
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