Keywords costotransverse unit;morphometry;thoracic spine;costotransverse unit screw;extrapedicular screw fixation;pedicle screw;pullout of strength;bone mineral density;

• 肋横突结合区;形态学测定;胸椎;肋横突结合区螺钉;椎弓根外螺钉;椎弓根螺钉;轴向拔出力;骨质密度;