方法回顾分析23例游离齿突小骨患者，其中10例有明确的外伤史。

Methods 23 patients with os odontoideum, 10 of whom had a history of definite lesion, were reviewed retrospectively.

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扭矩被分配在人字齿的两边，带来的优势是单边齿轮上小的应力及更高的刚性，以及使齿轮箱有更紧凑的设计。

The torque is partitioned on both helical tooth, this brings the advantage of a lower strain on the single teeth and a higher stiffness as well as a more compact design of the gearbox.

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