The etiology of Goal B type basilar invagination (BI) is still not clear, and it may be related to platybasia and short slope. There is no unified standard surgical strategy for Goal B type BI, and different surgical strategies have a great influence on the surgical results of patients. The purpose of our prospective study in China is to (1) further clarify the etiology of Goal B type BI, and (2) improve the surgical outcome in these patients.
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JOA Score（Japanese Orthopaedic Association Scores）
Timeframe: 1 months, 3 months, and 6 months postoperatively
NDI Score
Timeframe: 1 months, 3 months, and 6 months postoperatively