When a fracture occurs in the humeral trunk, the most easily injured is the brachial artery and brachial vein, especially the fracture of the middle and lower part of the humeral trunk. After the fracture is easily misaligned, it may compress the brachial artery and vein, or it may pierce and cause the rupture and bleeding of the vein or artery, which leads to extreme local swelling, and in serious cases, it may also affect the blood circulation of the distal part of the upper extremity, resulting in pale skin or numbness of the upper extremity, and the radial artery The radial artery may be weakened or even disappear. Usually, the fracture must be repositioned, and if the symptoms do not improve, emergency surgery must be performed immediately to investigate the damage to the brachial artery and, if necessary, to repair or anastomose it.