Left abdominal flexion is one of the clinical manifestations of splenic trauma. The typical symptom of simple splenic rupture is that after a direct blow to the left upper abdomen or a severe fall and impact, the child cannot stand upright immediately, especially with left abdominal flexion. The child cannot even stand up, and the lying position likes the left side downward and waist forward bending, not daring to move. The spleen is located deep in the left lower thoracic region, weighing about 75-150 grams, and is one of the most vulnerable organs in the abdominal cavity, with the incidence of spleen injury being as high as 40-50% in various abdominal traumas. Traffic accidents are the most common cause of splenic rupture (about 50%-60%), followed by injuries from falls, blows, bruises and stab wounds. Most splenic ruptures are along the edge of the splenic segment and are most common at the lower level of the spleen because the lower level of the spleen is less protected by the rib arch and the spleen is fragile and vulnerable to injury. Most splenic injuries do not involve the major large blood vessels in the splenic hilum, and if the rupture wound is directed along the splenic segment, there is rarely a vascular dissection of the splenic segment and the bleeding is slow and of short duration. If the rupture crosses the splenic segment, the vascular damage is more severe, bleeding is heavy and of long duration. If the damage involves the splenic hilum and splenic hilum, there is massive bleeding in a short period of time, with life-threatening hemorrhagic shock. The etiology of left abdominal flexion: Mostly seen in abdominal blunt force injuries or fall and impact accidents, mostly indirect shock injuries and rarely direct force injuries. It is often part of a serious closed injury such as a fall, collision, or car accident therefore it is possible to diagnose serious obvious trauma such as head injury, multiple fractures, etc. and ignore splenic rupture, or to diagnose splenic rupture and ignore other organ injuries health search. The spleen is a substantial organ with a high peritoneal tension and a brittle texture, which is an intra-abdominal fixed organ, but has a certain degree of mobility and is susceptible to rupture or laceration by strong vibration. The normal spleen is protected by the left quadrant of the rib cage and is not easily injured, but it is still the most vulnerable organ in the abdomen to rupture under strong vibration. If the spleen is large and diseased, especially if a large congested spleen is exposed under the quadrigeminal ribs, it is more likely to rupture. Blunt abdominal contusions and severe falls and bruises are the most common causes of splenic rupture. It often coexists with liver rupture. The chance of rupture is higher in an enlarged spleen due to disease, which can be caused by a minor inadvertent injury, called “natural rupture of the spleen” Pathogenesis: Because of the high tension of the spleen membrane, rupture is not easy to close the health search, so it is easy to stop bleeding. Internal bleeding is the prominent pathology and often causes shock due to massive bleeding. Because of the thin splenic peritoneum and the lack of connective tissue around the spleen, after rupture, blood flows into the free abdominal cavity and the rupture is difficult to retain blood clots and adhesions heal, so that even if the bleeding is temporarily stopped, the possibility of rebleeding is greater.