Objective: to provide the anatomical data of screw diameter for the use of transpedicular screw fixation.

目的：为椎弓根内固定术选用螺钉直径提供解剖学资料。

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Everything else unchanged, the bigger the screw diameter, the bigger is the depth of the screw flight in the metering section, which increases plasticizing capacity.

在螺杆的设计不变的情况下，螺杆直径越大，计量段的槽深便越深，增加了塑化能力。

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Everything else unchanged, the bigger the screw diameter, the bigger is the depth of the screw flight in the metering section, which increases plasticizing capacity.

在螺杆的设计不变的情况下，螺杆直径越大，计量段的槽深便越深，增加了塑化能力。

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