1. Objective to evaluate the influence of the number of burr holes on the operative result of chronic subdural hematomas.
目的分析颅骨钻孔数量对治疗慢性硬膜下血肿效果的影响。
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2. All holes, slots, edges and corners should be free of loose burrs and slivers. The allowable height of a burr cannot exceed five percent (5%) of the material thickness.
所有孔，缝，边和角必须没有毛刺和锐边。允许的毛刺的高度不能超过材料厚度的5%。
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3. All holes, slots, edges and corners should be free of loose burrs and slivers. The allowable height of a burr cannot exceed five percent (5%) of the material thickness.
