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。
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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