Final answer:
Yes, the spleen is the most commonly injured organ in blunt abdominal trauma due to its fragile nature and location just beneath the diaphragm, making it prone to injury and causing Kehr's sign when ruptured.
Step-by-step explanation:
The statement that the spleen is the most commonly injured organ in abdominal trauma is true. The spleen, located in the upper-left quadrant of the abdominopelvic cavity, is a fragile organ without a strong capsule, making it susceptible to injury. It is extensively vascularized, which also contributes to its vulnerability in abdominal trauma. When the spleen ruptures, blood spills into the area below the diaphragm, leading to Kehr's sign—a phenomenon where referred pain is felt in regions corresponding to the diaphragm rather than the spleen itself due to diaphragmatic irritation.