Objective: To study the quantitative relationship between the lateral margin of the superior facet and the pedicle center of lumbar vertebrae.
目的：探讨腰椎上关节突外缘的形态特点及其与椎弓根中心的关系。
And the static margin can be adjusted by change the vertical distance between the aerodynamic center and the center of gravity.
其静稳定性裕度可以通过重心与气动中心的纵向距离来调节。
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