Objective To compare the clinical effectiveness of fixations of odontoid process fractures preliminarily with anterior single one-threaded and double-threaded canulated compressive screws.
目的初步比较经颈前路单枚单头螺纹中空加压螺钉与双头螺纹中空加压螺钉内固定治疗齿突骨折的效果。
Assorted spindle vane configurations with threaded and non-threaded ends, single and double shrouds.
主轴叶片有螺纹和非螺纹以及单，双罩两种可选。
Assorted spindle vane configurations with threaded and non-threaded ends, single and double shrouds.
主轴叶片有螺纹和非螺纹以及单，双罩两种可选。
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