Objective To measure and compare the biomechanical properties of two different types of sacral screw fixation either through the superior endplate or anterior cortex.
目的测试骶骨螺钉经上终板固定技术的生物力学性能，并与经前皮质固定技术比较。
Objectives: To evaluate the biomechanical stability of two C1 lateral mass screw fixation techniques.
目的：评价两种寰椎侧块螺钉内固定技术的生物力学稳定性。
Objective To evaluate two types of pedicle screw fixation strength.
目的评价内锥及外锥形椎弓根螺钉固定的生物力学特点。
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