研究发现,髋关节牵引可导致旋股内、外动脉尤其股骨头供养血管闭塞与血运障碍[1-3],为了观察持续牵引、闭塞这些血管对股骨头血循环的影响尤其会否发生股骨头坏死(osteonecrosis of the femoral head,ONFH),笔者进行了经皮经腔犬旋股内动脉内结扎术(percutaneous transluminal medial femoral circumfflex arterial
The thermal lens effect has emerged in recent years as a novel ,highly sensitive tool for the study of the very weak molecular absorption of light energy,This p