It means that in the lower part pedicular screws must be introduced at a more convergent angle than in the upper part if we do not want to break any cortical of the vertebral body.
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美
释义
这意味着,假如我们不想打坏椎体的骨皮质,在椎弓根的下半部打入椎弓根螺钉时的汇聚角必须比上半部大。
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